Projects::TransferService should be more reliable

What does this MR do and why?

• Create worker EnqueueUsersRefreshAuthorizedProjectsWorker
• Use worker to enqueue low priority project_authorizations refresh in Projects::TransferService to assist with job timeouts.
• Change is behind project_authorizations_update_in_background_in_transfer_service feature-flag

References

• Related: !183920 (merged)
• Part of: https://gitlab.com/gitlab-com/request-for-help/-/issues/2980

MR acceptance checklist

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