If a merge request is closed, the quick action /rebase will quietly fail
with a 409 StaleObjectError. To avoid that, we disable this quick action
if the merge request is closed.

If a rebase is in progress, the quick action will also fail with the
same error. We now check the state and report to the user that the
rebase is in progress.

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/296223

Experiment user  context column to get merged rather than overridden

See merge request gitlab-org/gitlab!50684

The current behavior is being overridden

Add link to issue in issue due email

See merge request gitlab-org/gitlab!50642

Update feature categories for 2020-12-31

See merge request gitlab-org/gitlab!50709

- plus a test.

https://gitlab.com/gitlab-com/www-gitlab-com/-/merge_requests/70219
reorganised some of these categories. Most of the items that were under
`collection` can go to `usage_ping`, but the historical usage export
probably belongs under `provision` (as it's to do with license usage),
and the survey response are - tangentially - under `navigation`.

Quarantines flaky Usage Data Specs

See merge request gitlab-org/gitlab!50708

See tracking issue https://gitlab.com/gitlab-org/gitlab/-/issues/296169

Enlarge the timeline toggle button

See merge request gitlab-org/gitlab!50284

Grafana annotations for database reindexing

See merge request gitlab-org/gitlab!50194

* Introduce observer-like pattern.
* Refactor ReindexAction.keep_track_of and split

Use a dynamic segment not depending on the package id for Debian files

See merge request gitlab-org/gitlab!50433

Add project pipeline statistics test case for variable length months

See merge request gitlab-org/gitlab!50704

- 31st day of the month
- February in non-leap year

Revert "Merge branch '226988-notify-email_participants-instead-of-external_author' into 'master'"

See merge request gitlab-org/gitlab!50699

This reverts merge request !48823

Added documentation for new terraform list actions

See merge request gitlab-org/gitlab!50660

Add allowed to push superseding codeowners for web ide

See merge request gitlab-org/gitlab!50608

[DevOps Adoption] Daily updates - part 2

See merge request gitlab-org/gitlab!50416

Improve code readability in nuget search service

See merge request gitlab-org/gitlab!50667

Merge branch 'scalability/665-create-introductory-documentation-and-tutorial-about-stage-group-dashboards' into 'master'

Create introductory documentation and tutorial about Stage Group dashboards

See merge request gitlab-org/gitlab!50570

To allow easy migration of package files from incoming to the target
package.

Fix lint issues

See merge request gitlab-org/gitlab!50677

Introduce dismissal reason for vulnerability feedback

See merge request gitlab-org/gitlab!50632

Stablize register spec

See merge request gitlab-org/gitlab!50675

Migrate to native window scrolling

See merge request gitlab-org/gitlab!43167

We can replace jquery.scrollTo.js with commonUtils scrollToElement or
native browser scrolling.

Quarantine flaky default branch name setting spec

See merge request gitlab-org/gitlab!50645

Fix project export audit log spec

See merge request gitlab-org/gitlab!50644

Add Packages::Debian::GetOrCreateIncomingService

See merge request gitlab-org/gitlab!50431

Minor API readme style updates

See merge request gitlab-org/gitlab!50670