Update `Projects::BranchRule` initializer
<!--IssueSummary start-->
<details>
<summary>
Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards.
</summary>
- [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=535674)
</details>
<!--IssueSummary end-->
We need to update the initializer to toggle between current behavior and AR behavior (`super`) when the feature flag is toggled.
We will need to update every location that calls `Projects::BranchRule.new` (it is a lot)
issue