Add alert on preview when using /rebase quick action
<!--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=387982) </details> <!--IssueSummary end--> From https://gitlab.com/gitlab-org/gitlab/-/issues/372769/#note_1237538581 ### Issue If an MR reviewer uses the `/rebase` quick action and the project has "Prevent approvals from users who add commits" enabled, they are no longer able to approve or merge. ### Proposal Show a warning on `Preview` if someone is about to use `/rebase` and the project has "Prevent approvals from users who add commits" enabled. Similar to: ![Screenshot_2023-01-12_at_9.39.32_AM](/uploads/9c4f9e48be20086aad08a14d24aa4ef1/Screenshot_2023-01-12_at_9.39.32_AM.png) Text proposal: > Using the rebase quick action will prevent you from approving or merging this merge request
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