Fix unapproved unassigned merge request e-mails failing -- CE backport

Closes gitlab-ee#3092

See merge request gitlab-org/gitlab-ce!18007

Gitlab-workhorse still needs RepoPath on Git HTTP

See merge request gitlab-org/gitlab-ce!18050

Replace group spinach tests with RSpec analog

See merge request gitlab-org/gitlab-ce!17818

Bump Rugged to 0.27.0

See merge request gitlab-org/gitlab-ce!18069

Promote Timecop gem into joint test/development Bundler group

Closes #44751 et gitlab-ee#5359

See merge request gitlab-org/gitlab-ce!18066

https://gitlab.com/gitlab-org/gitlab-ce/issues/23036

Resolve "There should not be a jump discussion button on issues"

Closes #44717

See merge request gitlab-org/gitlab-ce!18034

Docs: replaces "Libre" => "Core"

See merge request gitlab-org/gitlab-ce!18060

Release notes: https://github.com/libgit2/libgit2/releases/tag/v0.27.0

This version solves a significant performance issue with generating
large diffs: https://github.com/libgit2/libgit2/issues/4460

Timecop was being used in the cycle analytics and burndown seed_fu tasks.
While it seems a little sketchy to use Timecop in this way, this seems like
an exception can be made for test fixtures.

Closes #44751, gitlab-org/gitlab-ee#5359

Use katex min css

See merge request gitlab-org/gitlab-ce!18061

QA: allow rspec files/options to be handled more consistently

See merge request gitlab-org/gitlab-ce!17990

Remove EE-specific comment markers from CE

Closes #44752

See merge request gitlab-org/gitlab-ce!18054

Move 'Registry' after 'CI/CD' navigation item

See merge request gitlab-org/gitlab-ce!18018

Added row hover styles to IDE file list

Closes #44293

See merge request gitlab-org/gitlab-ce!17906

Bumps omniauth google oauth2 gem version

See merge request gitlab-org/gitlab-ce!18055

Avoid Gitaly n+1 times per request for Project Branches performance

Closes #44657 et #37429

See merge request gitlab-org/gitlab-ce!17998

Fix code quality example documentation

See merge request gitlab-org/gitlab-ce!18053

Resolve "When forking any project, the images (avatar) of the groups (and subgroups) are not loaded."

Closes #44508

See merge request gitlab-org/gitlab-ce!18048

Resolve "For new created projects permissions are not inherited from group level"

Closes #44692

See merge request gitlab-org/gitlab-ce!18013

Fix https://gitlab.com/gitlab-org/gitlab-ee/issues/3092

Conflicts:
	ee/app/views/notify/unapproved_merge_request_email.html.haml
	spec/mailers/notify_spec.rb

Add JavaScript style guide

See merge request gitlab-org/gitlab-ce!17617

Document a few strategies to extract EE APIs

See merge request gitlab-org/gitlab-ce!17573

Allow merge requests related to a commit to be found via API

See merge request gitlab-org/gitlab-ce!18004

Resolve "Reference parsing conflicting with auto-linking"

Closes #44649

See merge request gitlab-org/gitlab-ce!18045

Make all workhorse gitaly calls opt-out, take 2

See merge request gitlab-org/gitlab-ce!18043

Test if remote repository exists before cloning

Closes #43929 and gitaly#1084

See merge request gitlab-org/gitlab-ce!18017

We displayed the correct text as the link text (without double-encoding), but
didn't do the same for the actual link target, so any link containing an
ampersand would break when auto-linked.

- NamespacesHelper#namespace_icon should return a URL instead of an image_tag for groups

Don't create permanent redirect when renaming a namespace

See merge request gitlab-org/gitlab-ce!17521

Drop JSON support from Projects::MilestonesController#show

Closes #33803

See merge request gitlab-org/gitlab-ce!17977