The behavior of assignee push options is not the same on GitLab EE
where many assignees are allowed as on GitLab FLOSS where only one
assignee is allowed.

So let's also have tests for GitLab EE.

We want to add tests to push_options_handler_service_spec.rb
for push options that change assignees of a merge request. For
these new tests we will need more than one user that can be
assigned to a merge request. So let's start by adding these
new users are refactoring code to check assignees a bit.

This should have been part of e4aec614
and https://gitlab.com/gitlab-org/gitlab/-/merge_requests/49827, but
some places were forgotten.

This should have been part of:

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/49814

but I tryed to simplify things too much there.

There are already push options for many things already, like
to add and remove labels from a merge request. See:

https://docs.gitlab.com/ee/user/project/push_options.html

But there is no push option yet to add and remove assignees
from a merge request. Let's implement that.
Signed-off-by: Christian Couder <christian@gitlab.com>

Move to btn-confirm from btn-success in groups/settings directory

See merge request gitlab-org/gitlab!55281

Move to btn-confirm from btn-success in groups/milestones directory

See merge request gitlab-org/gitlab!55278

Add a blurb about pinning gem versions

See merge request gitlab-org/gitlab!54932

To avoid being downgraded to vulnerable versions.

Remove sast_configuration_ui feature flag [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!55680

Document permission required for time tracking

See merge request gitlab-org/gitlab!55569

Adding additional test case for upload file button

See merge request gitlab-org/gitlab!55688

Move IDE routes from VUE to Rails

See merge request gitlab-org/gitlab!55597

In this commit we move the routing responsibility for the IDE
from the Vue router to Rails. This way we can provide helpful
information instead of requesting it afterward.

Optimize the Dictionary view to not repeat same columns

See merge request gitlab-org/gitlab!55145

Enhance ref_selector component to allow for tag creation

See merge request gitlab-org/gitlab!55193

This commit updates the ref selector component with some new abilities:

- New footer slot
- New events
- Validation state
- Allow for multiple instances on the same page

Resolve "Wiki edit page: title's styling mismatch"

See merge request gitlab-org/gitlab!50940

Remove capybara specs relying on jQuery.ajax

See merge request gitlab-org/gitlab!55668

We had some capybara specs that checked whether expanding a diff calls
the Backend more than once. These specs have been broken since we are
using axios. Unfortunately as they are testing a negative, they never
failed.

We are removing those specs in favor of new JS unit tests which actually
test that the API is called exactly once.

Remove obsolete DOMContentLoadedEventListener

See merge request gitlab-org/gitlab!55618

Move the isNumeric util to the shared number_utils.js

See merge request gitlab-org/gitlab!55833

Pipeline Graph: Update header capitalization

See merge request gitlab-org/gitlab!55835

Resolve "Fix translation of visibility levels" [RUN ALL RSPEC]

See merge request gitlab-org/gitlab!55721

Move to btn-confirm from btn-success in admin/labels directory

See merge request gitlab-org/gitlab!55273

  - Remove some attributes
  - Remove table
  - Generate new dictionary

Make it clear you need at least one job

See merge request gitlab-org/gitlab!55837

Automatically set position for VSA stages

See merge request gitlab-org/gitlab!55108

Update Gitaly version

See merge request gitlab-org/gitlab!55834