This also refactor the email_helper support spec to watch for multiple
emails being sent.

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

I first attempted to extract logic from the code that normalizes DNs, but I was unsuccessful. This is a hack but it works.

Replaces all the explicit include metadata syntax in the specs (tag:
true) into the implicit one (:tag).
Added a cop to prevent future errors and handle autocorrection.

The helper creates a fork of a project with all provided attributes,
but skipping the creation of the repository on disk.

This error was thrown before
```
source repository is empty
/builds/gitlab-org/gitlab-ce/lib/gitlab/git/repository.rb:838:in
`block in fetch_source_branch'
```

Closes #37789

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

So it can report the queries that we're run more compared to the
control point.

Signed-off-by: Rémy Coutable <remy@rymai.me>

We might also want to consider reduce the number of
connections in the tests. However I just tried setting it to 1
and that doesn't seem enough for feature tests.

This reverts merge request !14148

Revert "Merge branch '35012-navigation-add-option-to-change-navigation-color-palette' into 'master'"

This reverts merge request !13619

The following optimizations were performed:

- Add new association to GroupMember and ProjectMember

  This new association will allow us to check if a user is a member of a
  Project or Group through a single query instead of two.

- Optimize retrieving of Members when adding multiple Users