Trigger suggested reviewers for merge requests created from a branch

What does this MR do and why?

Trigger suggested reviewers for merge requests created from a branch

• Move to return unless project.can_suggested_reviewers? if this gets merged !99476 (merged)

Related to #376054 (closed)

How to set up and validate locally

1. Ensure a SaaS (Gitlab.com) environment
   • One way of doing this is to add a env.runit file to the root GDK folder with the following snippet export GITLAB_SIMULATE_SAAS=1
2. Set ultimate license on a group http://gdk.test:3000/admin/groups
3. Create a project in the ultimate group
4. Set the feature flag on rails console bin/rails c

project = Project.find(id-of-your-project) in the rail console
Feature.enable(:suggested_reviewers_control, project)

1. Edit a file (like Readme.md) and create a merge request on the project
2. You should see some failed workers in the sidekiq logs (due to lack of authentication) and some failed jobs in admin panel http://gdk.test:3000/admin/background_jobs

grep -r FetchSuggestedReviewersWorker log/sidekiq*

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.