Ensure MRs deleted in GitLab are also deleted in Jira

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Once you have setup the GitLab.com for Jira Cloud application in Jira, if you mention a Jira issue (e.g. GIT-1) in GitLab while creating a new MR (e.g. GIT-1-dev-mr), the MR appears as a pull request in the Jira Development Panel.

We have updated the branch_hooks_service.rb to remove a branch from Jira when it is deleted on GitLab, however, we need to follow up on this work and also delete the Pull Request on Jira when a merge request is deleted.

Currently Merge Request are synced with JiraConnect in the app/services/merge_requests/base_service.rb, so it would require enqueuing a new worker when merge requests are deleted.