[inline_comments_data_collection] Failed to fetch diff: 429 Client Error: Unknown Error for url

https://github.com/mozilla/bugbug/runs/49275574435:

ERROR:scripts.inline_comments_data_collection:Failed to fetch diff: 429 Client Error: Unknown Error for url: https://phabricator.services.mozilla.com/D2027?vs=50451&id=50454&download=true

  0% 70/109225 [01:06<28:52:38,  1.05it/s]
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/site-packages/scripts/inline_comments_data_collection.py", line 104, in process_comments
    fix_patch_id = diff_phid_to_id[most_recent_update["fields"]["new"]]
                   ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
KeyError: 'PHID-DIFF-cmwvop63hgl7y62rj3oi'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/bin/bugbug-fixed-comments", line 7, in <module>
    sys.exit(main())
             ^^^^^^
  File "/usr/local/lib/python3.12/site-packages/scripts/inline_comments_data_collection.py", line 187, in main
    for data in process_comments(
                ^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/scripts/inline_comments_data_collection.py", line 106, in process_comments
    diffs = api.search_diffs(diff_phid=most_recent_update["fields"]["new"])
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/libmozdata/phabricator.py", line 252, in search_diffs
    out = self.request(
          ^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/libmozdata/phabricator.py", line 670, in request
    response.raise_for_status()
  File "/usr/local/lib/python3.12/site-packages/requests/models.py", line 1026, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 429 Client Error: Unknown Error for url: https://phabricator.services.mozilla.com/api/differential.diff.search

Start with scripts/inline_comments_data_collection.py, especially process_comments, and trace the fallback through libmozdata/phabricator.py and search_diffs. Reproduce or inspect the linked GitHub Actions run and Phabricator request to understand the 429 response. Done means the collection run handles this failure without the shown traceback and can continue processing comments.