Made diff file headers sticky

Closes #48816

See merge request gitlab-org/gitlab-ce!23249

Add rails version to all migrations

Closes #54098

See merge request gitlab-org/gitlab-ce!23057

Show toggle tree button on merge request commits

Closes #53019

See merge request gitlab-org/gitlab-ce!23238

Limit `gitlab:assets:compile` job to branches and tags

Closes #54361

See merge request gitlab-org/gitlab-ce!23302

Fix typos occured to occurred

See merge request gitlab-org/gitlab-ce!23105

Resolve "`fetch-assets` job times out so `package-and-qa` jobs can't complete"

Closes #54293

See merge request gitlab-org/gitlab-ce!23267

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/48816

DB schema generated by a migration may look different in
rails 4 and 5 (because rails 5 may use different default values).
For this reason it's important to explicitly set for which rails
version a migration was written for.

See https://stackoverflow.com/questions/35929869/activerecordmigration-deprecation-warning-asks-for-rails-version-but-im-no/35930912#35930912

When switching to rails 5, we added migration version to all migration
classes. This patch makes it possible to run versioned migrations
also with rails 4

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/53019

Fix markdown to render correctly

See merge request gitlab-org/gitlab-ce!23221

Remove broken link that 404s and has no alternative

See merge request gitlab-org/gitlab-ce!23295

SystemCheck: Use a more reliable way to detect current Ruby version

Closes #46950

See merge request gitlab-org/gitlab-ce!23291

Revert "Merge branch 'revert-e2aa2177' into 'master'"

Closes #54267

See merge request gitlab-org/gitlab-ce!23237

Add cop prohibiting params argument in url_for

Closes #47986

See merge request gitlab-org/gitlab-ce!23115

Fix typo in scheduled pipelines

See merge request gitlab-org/gitlab-ce!23218

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

Update discord_notifications.md

See merge request gitlab-org/gitlab-ce!23292

Docs: fix API move issue curl command

See merge request gitlab-org/gitlab-ce!23290

Update docs for include to mention required file extension

Closes #53596

See merge request gitlab-org/gitlab-ce!23048

Update rack to 2.0.6

Closes #54201

See merge request gitlab-org/gitlab-ce!23171

Docs: Cleaning up various links

See merge request gitlab-org/gitlab-ce!23110

Use `gl-tooltip` directive in badges, cycle analytics, and diffs

See merge request gitlab-org/gitlab-ce!22770

Upgraded minimum Git version to 2.18.0

Closes #47494

See merge request gitlab-org/gitlab-ce!22803

See https://gitlab.com/gitlab-org/gitlab-ui/issues/89