Merge branch 'master' into 38759-fetch-available-parameters-directly-from-gke-when-creating-a-cluster

Revert "Merge branch '5480-sidebar-subscription-event-handling' into 'master'"

Closes #45979

See merge request gitlab-org/gitlab-ce!18692

Remove old GitLab Shell namespace actions implementations

See merge request gitlab-org/gitlab-ce!18681

Deprecation of ActionView's time_ago_in_words

Closes #45761

See merge request gitlab-org/gitlab-ce!18607

Increase new issue metadata form margin

Closes #44134

See merge request gitlab-org/gitlab-ce!18630

Save and expose only generic merge error

See merge request gitlab-org/gitlab-ce!18646

Merge branch '45970-broken-master-in-spec-features-issues-user_uses_slash_commands_spec-rb' into 'master'

Resolve "Broken master in spec/features/issues/user_uses_slash_commands_spec.rb"

Closes #45970

See merge request gitlab-org/gitlab-ce!18687

This reverts merge request !18682