Add alert on preview when using /rebase quick action

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From #372769 (comment 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:

Text proposal:

Using the rebase quick action will prevent you from approving or merging this merge request