Follow-up from "Add experimental GraphQL mutation for latest diff comments"

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The following discussion from !224052 (merged) should be addressed:

• @phikai started a discussion: (+7 comments)

  @marc_shaw One of my thoughts around abstracting commenting here is that if we could somehow get to ONE interface for ALL the comment types... right now we have:

  • https://docs.gitlab.com/api/notes/
  • https://docs.gitlab.com/api/discussions/
  • The version of Discussions for Diffs
  • https://docs.gitlab.com/api/draft_notes/

  The way I've been thinking about this is how do we make it easy for external tools to consume and comment (READ and WRITE) in merge requests.

  I'm not saying that needs to be the scope for this particular experiment, but I think it's what we should strive for long term here.