Merge Request quick actions could use additional specs

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Proposal

via @mayra-cabrera here

It'd be great if we could split the tests on this file somehow, or perhaps create a dedicate spec file for merge_request_actions.rb (e.g merge_request_actions_spec.rb), since this file is getting quite large (over 2k lines!).

The quick actions for merge requests have specs to interpret/parse the commands but don't actually have tests to make sure the commands worked. Ex: Does /assign_reviewer actually assign the reviewer to the MR?