Show rule button tooltip for merge request approval policy

What does this MR do and why?

Related #505007 (closed)

Show rule button tooltip for merge request approval policy

This makes sure the Add rule button in the merge request approval policy editor is not hidden when hitting the limit, but instead disabled, with a tooltip.

Changelog: changed EE: true

References

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Screenshot_2024-11-27_at_18.20.38

How to set up and validate locally

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