Fix file diff title and renames alignment in discussions

Closes #31782

See merge request !12169

Stop using deprecated `path` field on Gitaly messages

See merge request !12112

#13336 - display multiple messages in both the UI and git output

Closes #13336

See merge request !11113

Document a new migrations testing technique

Closes #33565

See merge request !12181

Add age color mapping to blame view

Closes #23998

See merge request !7198

Make spec/spec_helper consistent with EE by including a :routing type

See merge request !12178

Do not show manual actions that cannot be run

Closes #32380

See merge request !12121

Backport merge_params.html.haml conflict comment

See merge request !12138

Instrument MergeRequestDiff#load_commits

See merge request !12162

Don't return nil for missing objects from parser cache

See merge request !12168

Fix note highlight being lost after real time update

Closes #33483

See merge request !12098

Fix milestone page assignees when dropped in ongoing list

Closes #32861

See merge request !12076

Update /target_branch slash command description to be more consistent

See merge request !12175

Require rubocop-rspec in the correct location

See merge request !12174

This revealed an error in our configuration generation in
gitlab:gitaly:install rake task. The fix is included

Resolves the `codeclimate` CI failure

Fix autocomplete not working on note edit form

Closes #33529

See merge request !12106

Fixed pipelines Vue template not ending correctly

See merge request !12170

Move remove token of Select2 to the right

See merge request !12101

Add a custom RSpec/SingleLineHook cop

Closes #24891

See merge request !11911

This cop adds an offense when `before`, `after`, or `around` are used as
single-line blocks.

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/31782

The unused toggle was removed previously,
https://gitlab.com/gitlab-org/gitlab-ce/commit/cc37d1dfa11691f2d8357151d4b722b3d114881e#cf11229dd714f7f4b46f102ce6846e25528b6689_7_6

Fix fenced code block misalignment in events/activity

Closes #31263

See merge request !12149

Add codeclimate job to .gitlab-ci.yml

See merge request !12086

more visual contrast for active page in pagination widget

Closes #32470

See merge request !12119

Allow more customization to Help landing page

See merge request !11878

Implement diff viewers

Closes #30501 and #19931

See merge request !11777

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/33529

Bug introduced in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11278

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/32861

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/33483

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>