Single commit squash of all changes for https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10878

It's needed due to https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10777 being merged with squash.

Fix `Routable.find_by_full_path` on MySQL

See merge request !11146

Add tooltips to user contribution graph key

Closes #23751

See merge request !11138

Resolve "Redirect to new project link after a rename"

Closes #17361 and #30317

See merge request !11136

Use an absolute path for locale path in FastGettext config

See merge request !11141

Trigger click instead of actual click to make sure the right button is always hit

Closes #30504

See merge request !11127

Fix fork_spec failure to do with mySQL

Closes #31870

See merge request !11121

Unicorn was unable to start due to this bad config on Omnibus.

Colorize labels in issue search field

Closes #30467

See merge request !11047

Merge branch '29925-gitlab-shell-hooks-can-no-longer-send-absolute-paths-to-gitlab-ce' into 'master'

Generate and handle a gl_repository param to pass around components

Closes #29925

See merge request !10992

Include droplab-item-ignore in droplab docs

See merge request !10808

Fix new admin integrations not taking effect on existing project

Closes #26376

See merge request !11069

Fix Karma failures for jQuery deferreds

See merge request !11134

We’ve seen a deadlock in CI here https://gitlab.com/mkozono/gitlab-ce/builds/15644492#down-build-trace. This commit should not fix that particular failure, but perhaps it will avoid others.

* Don’t call delete_conflicting_redirects after update if the path wasn’t changed
* Rename descendants without using recursion again, so we can run delete_conflicting_redirects exactly once.

Add sidebar specs

See merge request !11132

Add ruby_parser gem for all environments.

See merge request !11130

Backport of Multiple Assignees feature

See merge request !11089

Note: This changes the behavior of user lookups (see the spec change) so it acts the same way as groups and projects. Unauthenticated clients attempting to access a user page will be redirected to login whether the user exists and is publicly restricted, or does not exist at all.

Not sure why this fixes this error:

```
ActiveRecord::RecordNotUnique:
       PG::UniqueViolation: ERROR:  duplicate key value violates unique constraint "index_routes_on_source_type_and_source_id"
       DETAIL:  Key (source_type, source_id)=(Project, 1) already exists.
       : INSERT INTO "routes" ("source_type", "path", "name", "source_id", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5, $6) RETURNING "id"
```