This adds a new feature flag: `rebalance_issues`

This flag is scoped by project, and is read in the issue create and
update services.

This adds a new method in the issues base_service that rebalances the
issue set when the issue is placed in the extreme 0.0001 fringes of the
relative positioning range.

This adds the required worker queue definition for sidekiq, with its
configuration and generated defintion.

Remove git ignored schema_migration files

See merge request gitlab-org/gitlab!40291

Merge branch '872-merge-glskeletonloading-into-glskeletonloader-gitlab-ui-integration-test' into 'master'

GitLab UI: 872-merge-glskeletonloading-into-glskeletonloader integration test

See merge request gitlab-org/gitlab!38663

Bump marginalia gem version to 1.9.0

See merge request gitlab-org/gitlab!40481

Extract page specific styles todos

See merge request gitlab-org/gitlab!38890

Instead of using globbing and because we want to move these page
specific styles to the appropriate pages, we move the imports to a new
file.

Fix Long Content Collapses Icons in Vulnerability Comment

Closes #234085

See merge request gitlab-org/gitlab!40407

Add pipeline_artifacts_size to root_storage_statistics

See merge request gitlab-org/gitlab!40425

Remove users.bio column

Closes #226989

See merge request gitlab-org/gitlab!40269

Allow snippet move actions without an existing file name

See merge request gitlab-org/gitlab!40343

Doc - remove outdated message

See merge request gitlab-org/gitlab!40373

Count security jobs

See merge request gitlab-org/gitlab!39481

Add version history to distributed reads

See merge request gitlab-org/gitlab!39793

Add more US spelling rules

See merge request gitlab-org/gitlab!40204

Scope down Chrome version for icon fix

See merge request gitlab-org/gitlab!40526

To account for changes to `GLSkeletonLoader`

The main change is the addressed Ruby 2.7 warnings

Wrap dashboards dropdown items text

See merge request gitlab-org/gitlab!40367

Add button to return to merge request on pipeline celebration

Closes #230497 and #223110

See merge request gitlab-org/gitlab!37393

The pipeline suggest 1st nudge starts on the merge request, so:

- the 1st nudge was changed to pass the merge request path from
the 1st to the 2nd/3rd nudge.

- the 3rd nudge was changed to set the Merge request path into
the cookie set when clicking the Commit Changes button.

- the 4th nudge then checks for the cookie name instead of just
the cookie existence. The merge request path is used for the new
button. If they happened to have an old cookie, it links to the
project merge request list instead.

Geo - Refactor finders (Part I)

See merge request gitlab-org/gitlab!40313

notification_service_spec.rb: Convert some let to let_it_be to save re-creating DB records

See merge request gitlab-org/gitlab!40446

Fix helper method parameters in notification_service_spec.rb

See merge request gitlab-org/gitlab!40495

Put Pages moves from namespace renames and transfers in Sidekiq

See merge request gitlab-org/gitlab!40259

Add docs for FactoryDefault

See merge request gitlab-org/gitlab!40374

Add iteration report path tests

See merge request gitlab-org/gitlab!40513

Add mermaid charts and clarify re-adding users

See merge request gitlab-org/gitlab!40445

When checking the Chromium changelog, we can see that they backported
the SVG fix to: `84.0.4147.125` [0]. So we can actually scope our fix
deployment down to that version.

For Edge we have figured out which version to use based on it's
useragent: `84.0.522.59`, for example:

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML,
like Gecko) Chrome/84.0.4147.125 Safari/537.36 Edg/84.0.522.59

[0]: https://chromium.googlesource.com/chromium/src/+log/84.0.4147.89..84.0.4147.125?pretty=fuller&n=10000

FactoryDefault allows to reuse a single factory
for all implicit parent associations

Merge branch 'mwaw232076-full-text-search-and-time-picker-is-not-be-available-for-managed-apps' into 'master'

Resolve "Full text search and time picker is not be available for managed-apps"

See merge request gitlab-org/gitlab!37926

After the changes to use the tracking database
as SSOT the behavior of these methods are the
same.

Replace fa-user-secret icon with GitLab SVG incognito icon

Closes #225209

See merge request gitlab-org/gitlab!40281