Allow Code Review Discussions to be Resolved from Commit Message
### Problem to solve During the code review process many discussions are created that require resolution. There is currently no way to resolve these via commit message and users are required to go back to the issue and resolve the discussion. ### Intended users Anyone who submits changes for review and ends up in a review cycle. ### Proposal We already support [resolution of most items via commit message](https://docs.gitlab.com/ee/user/project/issues/automatic_issue_closing.html). Discussions should be added to this support. In order to do this discussions would need an identifying piece of information that allows them to be resolved via commit message. This could be something simple like `Resolves #12345[2]`. This would indicate that in `Issue 12345` we're resolving `discussion 2`. ### What does success look like, and how can we measure that? Success will see more discussions resolved via commit and less via the action button. We should be able to distinguish the resolution action via usage ping. ### Links / references
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