For some old merge requests, we don't have enough information to figure out the
old blob and the new blob for the file. This means that we can't highlight the
diff correctly, but we can still display it without highlighting.

We didn't have a fallback case before, because we believed the conditions were
exhaustive. They weren't, so we can always fallback to not previewing.

Fix Import/Export issue to do with fork merge requests

Closes #36666

See merge request !13717

Fix caching of future broadcast messages

Closes #36661

See merge request !13667

Use an event-based system when waiting for AuthorizedProjectsWorker to complete

See merge request !13564

[ci skip]

Improves subgroup creation permissions

Closes #35845

See merge request !13418

Hashed Storage support for Repositories

Closes #28283

See merge request !13246

Using `extend` dynamically can lead to bad performance as it
invalidates the method's cache.

Correctly encode string params for Gitaly's TreeEntries RPC

Closes #36720

See merge request !13724

Merge branch '36298-use-non-i18n-values-for-setting-new-group-level-issue-mr-button-text' into 'master'

Use non-i18n values for setting new group-level issue/MR button text

Closes #36298

See merge request !13570

Add docs for group issues page and group merge requests page

Closes #36533

See merge request !13678

Only require sidekiq-limit_fetch when enabled in settings

Closes #36253

See merge request !13715

This changes the caching mechanism so we cache both current _and_ future
broadcast messages, then manually filter out those we don't want to
display. This ensures we don't need any additional queries while still
being able to display the right messages at the right time.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/36661