Due to a stale NFS cache, it's possible that a branch lookup fails
while `git gc` is running and causes missing branches in merge requests.

Possible workaround for #15392

have been fully redacted and contain cross-project references.

The previous implementation relied on Note#cross_reference_not_visible_for?,
which essentially tries to render all the Markdown references in a system note
and only displays the note if the user can see the referring project. But this
duplicated the work that Banzai::NotesRenderer was doing already. Instead, for
each note we render, we memoize the number of visible user references and
use it later if it is available.

Improves #19273

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Workflows which use a bot to merge should remove branches if requested.
Expose the flag so that bots can request know this.

This allows us to drop our disable email config override

squashed - refactor to cope with sub sub N relations probably using the sub_relations method recursively.

It is already part of ProjectEntity.

This caches various queries to ensure that multiple reference extraction
runs re-use any objects queried in previous runs.

No longer shows New Snippet button to users who aren't able to create a new snippet in the given context.

Also removes the plus icon from the New Snippet buttons, as they're no longer used in other creation buttons.

Fixes #14595.

When rendering a list of diff files, skip those where the diff is over
10 KB and provide an endpoint to render individually instead.

This reverts commit bf2a86b7.

This reverts commit 68155ee7, reversing
changes made to 7ebd011e.

If the Sidekiq job fails for some reason, a project can be 'stuck'
pending deletion. The project can't be viewed, so it shouldn't be
available through the notification settings association as this will
throw an exception when we try to show the link.

As requested by the issue #14508 this adds an option in the application
settings to set newly registered users by default as external. The
default setting is set to false to stay backward compatible.

We just need to get merge requests closes issues when 
we’re going to show them

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