Add ability for flow to add comment to MR with suggested changes

Problem

It's unclear to the end-user that an MR with a fix got created after they pressed on the button to fix their Pipeline.

Desired Outcome

Have the Flow comment on the original MR with a link to the created MR with the fix.

Potential Implementation.

Use CreateMergeRequestNote in the fix_pipeline flow to comment on an MR with suggested fixes for a pipeline.

We could potentially re-use parts of the prompts for system and user in the review_merge_request prompts.