Update build log incrementally

Proof of concept implementation of incremental sending of build log to browser.

cc @jschatz1 @vsizov @grzesiek @tmaczukin 


See merge request !3737

Updated CHANGELOG for 8.7.5

See merge request !4129

Only show forks for users who can download code

The ForksController enforces this, so don't show the link if it won't go anywhere.

Closes #14272.

See merge request !4017

[ci skip]

Reuse runners edit form in admin and project area

Reuse runners edit form in admin and project area.

![reuse_runner_form](/uploads/d16e3ee196151b68f584d947f38a7c29/reuse_runner_form.png)

See merge request !4094

Removed tracking of total method execution times

See #17239 and 945c5b3f for more details. The Grafana dashboards used to visualize performance data were updated a while ago to no longer display this data.

See merge request !4124

The ForksController enforces this, so don't show the link if it won't go
anywhere.

Group commits by date in server timezone

`Time#to_date` just takes the (timezone-less) year, date, and month, and
creates a new date from that. Because the commits in the list are
grouped by date, rather than chunked when the date changes, a commit can
be shown in the wrong order if its CommitDate has a timezone-less date
that's different to other commits around it.

Convert all CommitDates to the server timezone before grouping, as that
will at least produce consistent results. Users can still see a
timestamp on the commit that doesn't match the date it's grouped under,
because the timestamp shown uses the user's local timezone, and the
grouping uses the server's timezone, but that was an issue anyway.

### Before
![image](/uploads/1ffe0e2f86e03590cb96126d4f340436/image.png)

### After
![image](/uploads/b1be1b08782385d13c56528242a5829b/image.png)

Closes #3870 and closes #17300.

See merge request !4052

Update cas.md to reflect the current syntax, and added that gitlab-ctl reconfigure should be run.

I spent a while trying to figure our why the cas wasn't working!

Someone may need to update the source code section of the wiki

See merge request !3850

Because method call timings are inclusive (that is, they include the
time of any sub method calls) this would lead to the total method
execution time often being far greater than the total transaction time.
Because this is incredibly confusing it's best to simply _not_ track the
total method execution time, after all it's not that useful to begin
with.

Fixes gitlab-org/gitlab-ce#17239

Update 8.8 guides

See merge request !4119

Relative Links in the Wiki Are Broken

- [ ] #16568 (!4050) Relative links in wiki are broken
    - [x] Investigate issue

  
    - [x] Implementation / Fix

        - [x] Write (failing) tests for `WikiLinkFilter`
        - [x] Link to `./bar` should either get rewritten correctly or left alone
        - [x] Link to `./bar.md` should maybe get rewritten correctly (is left alone currently)
        - [x] Link to `bar.md` should get rewritten correctly


            - [x] Check if this indeed a bug

    - [x] Make sure CI is green
    - [x] Assign to endboss

    - [x] Wait for review

    - [x] Implement review feedback
    - [ ] Wait for merge


See merge request !4050

- Separate 'exercise' and 'verify' steps of tests.
- Use `build_stubbed` instead of `build`

- And fix behavior for non-file hierarchical links.

Add snippet tab under user profile

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/15572

See merge request !4001

Remove unused `icon_for_event` helper

Extracted from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4090

See merge request !4120

Don't show the Todo count if there aren't any Todos.

When there are 0 Todos, the Todos icon still had the blue badge with a "0" in it, which made me think I had a new Todo left. This makes it less annoying.

Follow-up on !4077.

**Before:**

![Screen_Shot_2016-05-10_at_9.36.57_PM](/uploads/e0dfafae01692286096606c3251f0997/Screen_Shot_2016-05-10_at_9.36.57_PM.png)

**After:**

![Screen_Shot_2016-05-10_at_10.01.02_PM](/uploads/30a8bafe8f54862418eb4045e5777a9a/Screen_Shot_2016-05-10_at_10.01.02_PM.png)

cc: @jschatz1 @rspeicher 

See merge request !4113

Improve documentation and web test for web hooks

Tips and documentation of actual hook behavior. Improved user feedback
when testing hooks via the web UI.

See merge request !4015

Remove Rails monkey-patches now that we're using Rails 4.2.6

Closes #17356.

See merge request !4115

Improve log message when a project is destroyed to include the namespace

See merge request !4114

Restrict starred projects to viewable ones

`User#starred_projects` doesn't perform any visibility checks. This has
a couple of problems:

1. It assumes a user can always view all of their starred projects in
   perpetuity (project not changed to private, access revoked, etc.).
2. It assumes that we'll only ever allow a user to star a project they
   can view. This is currently the case, but bugs happen.

Add `User#viewable_starred_projects` to filter the starred projects by
those the user either has explicit access to, or are public or
internal. Then use that in all places where we list the user's starred
projects.

Closes #17249.

See merge request !4108

Only generate repository push email once

The repository push email can be very expensive to generate, especially
with syntax-highlighted diffs. Instead of generating the email for each
recipient, generate one email object and reset the Message-Id and To
headers for each recipient. (Cloning would also be expensive in the case
of large emails, although probably not as bad as generating from
scratch.)

Closes #17270.

See merge request !4070

Updated 8.7.4 CHANGELOG entries

See merge request !4116

[ci skip]

Signed-off-by: NRémy Coutable <remy@rymai.me>

`Time#to_date` just takes the (timezone-less) year, date, and month, and
creates a new date from that. Because the commits in the list are
grouped by date, rather than chunked when the date changes, a commit can
be shown in the wrong order if its CommitDate has a timezone-less date
that's different to other commits around it.

Convert all CommitDates to the server timezone before grouping, as that
will at least produce consistent results. Users can still see a
timestamp on the commit that doesn't match the date it's grouped under,
because the timestamp shown uses the user's local timezone, and the
grouping uses the server's timezone, but that was an issue anyway.

Enable Rubocop Casecmp Performance Cop.

Also fixes the errors caused by enabling the cop.

`casecmp` is more performant than `.downcase` and `==`.

See also: https://github.com/bbatsov/rubocop/blob/master/lib/rubocop/cop/performance/casecmp.rb

See merge request !3957

Enable the StringReplacement cop.

Also fix one use of `gsub` that would be faster as `delete`.

Use `tr` instead of `gsub` when you are replacing the same number of characters. Use `delete` instead of `gsub` when you are deleting characters.

See merge request !3960

The repository push email can be very expensive to generate, especially
with syntax-highlighted diffs. Instead of generating the email for each
recipient, generate one email object and reset the Message-Id and To
headers for each recipient. (Cloning would also be expensive in the case
of large emails, although probably not as bad as generating from
scratch.)

When there are 0 Todos, the Todos icon still had the blue badge with a "0" in it, which made me think I had a new Todo left. This makes it less annoying.

Follow-up on !4077.

Removes jquery-scrollto-rails.

Instead the script is now included directly from the vendor directory.

Resolves #17166. Working towards #14286 and merging !3775.

The gem was on 1.4.3.1, here's the diff between that tag and 2.1.2 (the version I'm using in this MR): https://github.com/flesler/jquery.scrollTo/compare/1.4.3...2.1.2

There aren't any notable breaking changes that I noticed, and I didn't see any JS errors after testing a bunch of pages.

cc: @jschatz1 

See merge request !4088

Merge branch 'master' of gitlab.com:gitlab-org/gitlab-ce into issue_15572_snippets_tab_under_user_profile

Also fix one use of `gsub` that would be faster as `delete`.

Use `tr` instead of `gsub` when you are replacing the same number of
characters. Use `delete` instead of `gsub` when you are deleting
characters.