Remove `error_tracking` feature flag

See merge request gitlab-org/gitlab-ee!9216

We introduced the feature flag `error_tracking` to test the Sentry MVC
safely.

After the successful test, we remove it again.

Fix vertical alignment of search box icons in issue board switcher for Safari

Closes #9240

See merge request gitlab-org/gitlab-ee!9190

Remove unwanted margin above suggested changes.

Closes #56389

See merge request gitlab-org/gitlab-ce!24419

License: Drop end year in favor of "present"

See merge request gitlab-org/gitlab-ee!9229

Improvements for spec migration readme

See merge request gitlab-org/gitlab-ce!24440

Add support for auto-expanding Roadmap timeline on horizontal scroll

Closes #9119 and #7325

See merge request gitlab-org/gitlab-ee!9018

Update vuex.md - swap PUT/POST methods

See merge request gitlab-org/gitlab-ce!24494

Fix Resource attribute bug

See merge request gitlab-org/gitlab-ce!24407

Makes Roadmap timeline dynamic to be always
scrollable on any screen size.
Fetches new epics as user scrolls into past or future and renders it.

Update reference to ~Monitoring to be ~Monitor

See merge request gitlab-org/gitlab-ce!24489

Correct minimum yarn version in 11.6 -> 11.7 upgrade doc

Closes #56254

See merge request gitlab-org/gitlab-ce!24495

Cleanup stale +deleted repo paths on project removal (adjusts project removal bug)

Closes #46146

See merge request gitlab-org/gitlab-ce!24269

View epic permissions

See merge request gitlab-org/gitlab-ce!24483

Removes `Created date` & `Last updated` sort
options from Roadmap, making it limited to Epics list

Return the maximum group access level in the projects API

Closes #43684

See merge request gitlab-org/gitlab-ce!24403

1. When removing projects, we can end-up leaving the +deleted
repo path dirty and not successfully removing the non-deleted
namespace (mv process is not atomic and can be killed without
fully moving the path).

2. In order to solve that, we're adding a clean-up phase on
ensure which will schedule possible staled +deleted path deletion.
Note that we don't check the current state (if there is or not a
repo) in order to schedule the deletion. That's intentional
in order to leverage Gitlab::GitalyClient::NamespaceService#remove
idempotency and ensure consistency.

Add documentation for new NGINX Ingress metrics

Closes #56473

See merge request gitlab-org/gitlab-ce!24449

[EE Backport] Add notes filters for epics

See merge request gitlab-org/gitlab-ce!24372

Add notes filters for epics

Closes #7581 and #7526

See merge request gitlab-org/gitlab-ee!8978

Add flat-square badge style

Closes #30120

See merge request gitlab-org/gitlab-ce!24172

Move all the prepend in controllers to bottom

Closes #8598

See merge request gitlab-org/gitlab-ee!8921