Capability to edit "Rebase" button commit message

Proposal

I would like for the possibility, either at the project level or at the MR level (project level is probably best) to be able to set an overriding commit message.

We currently use the push rules, to enforce the commit message rules. Looks like the rebase button can override those rules and push the rebase commit. Then the MR is "borked" as it will not allow the MR to be merged, claiming the push rules have been violated.

It would be great to be able to edit that, and even use the rebase commit message to trigger certain actions in the pipeline.

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