Trigger mergeRequestMergeStatusUpdated when discussion is marked or unmarked as resolved

Problem to solve

We want the merge widget to show updated status when MR discussions get all resolved or when an MR discussion gets unresolved.

Proposal

Trigger the mergeRequestMergeStatusUpdated subscription when:

• all MR discussions get resolved
• an MR discussion gets unresolved

We can trigger the subscription in Discussions#ResolveService (check for MergeRequest#mergeable_discussions_state?) and Discussions::UnresolveService.

Availability and testing

Recommended to add a feature spec for:

• when all discussions get resolved
• when all discussions are resolved, unresolve one discussion

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