Duplicate Bot: Handle failure modes better (#57663)

- don't fail to parse json when Claude ignores the instructions and
returns fenced json
- don't fail to search for issues by area labels when Claude ignores the
instructions and returns prose instead of comma-separated list
- don't mark workflow runs as successful when json parsing blew up or
posting the comment failed

Release Notes:

- N/A
b72e57da65Lena committed on 5/25/2026, 4:49:51 PM· committed by GitHubparent2e20860
1 file changedLine totals unavailable