Add /approve and /unapprove quick actions for merge requests

Problem to solve

It is not possible to approve or unapprove merge requests with quick actions.

Further details

Quick actions are very useful for people who spend a lot of time working with merge requests.

Proposal

I would propose that /approve and /unapprove quick actions be implemented. These actions would respectively add or remove an approval from the user for the merge requests in context.

What does success look like, and how can we measure that?

The functionality being implemented.

Links / references

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