Replace PhantomJS with Chrome in Karma test runner (2nd attempt)

Closes #33633

See merge request !12144

Issue board docs

See merge request !12197

Jira integ docs

See merge request !12196

Confidential issues redesign docs

See merge request !12195

Update ruby metrics endpoint text to be clearer

See merge request !12157

Unify email layouts: devise emails

See merge request !10483

Support a configurable Rails asset_host to allow for CDNs

See merge request !12102

Add a link to spec/migrations/README.md in the testing documentation

See merge request !12191

[ci skip]

Deserialize custom notifications

Closes #24892

See merge request !12055

Try to use the same pattern as other spec in this file

Closes #33614

See merge request !12192

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

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

Service hostname also include registry name, when using non Docker Hub registry.

See merge request !11729

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

Create a post-deployment migration to update all existing notification settings
with at least one custom level enabled to the new format. Also handle the same
conversion when updating settings, to catch any stragglers.

Add columns for each custom notification level, defaulting to null. Read from
those columns if non-null, otherwise fall back to the serialized column. Writing
will write to the new column if `events` isn't manually set.

#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

[ci skip]

Adds support for https://gitlab.com/gitlab-com/infrastructure/issues/57