Prevent rebasing from UI for branches containing GPG signed commits

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Problem to solve

Gitlab allows a reviewer to rebase the branch of a merge request from the UI. The automatic rebase can (obviously) not re-sign GPG signed commits when doing so, but does the rebase anyway, leading to signature loss.

Intended users

• Sasha (Software Developer)

Proposal

Either disallow automatic rebasing of a branch if it contains GPG signed commits, or show a warning that this will lead to signature loss. This could be hidden behind an option, but I imagine we don't want to have 1000 different options for merge behaviour either.