Clear not_landed needinfos after patches land

[loganrosen]

Closes #3003.

Summary

• track the exact Phabricator revisions that caused each not_landed needinfo
• clear only open needinfo flags attributable to the rule when every tracked revision is published or the bug is closed
• migrate existing tracked needinfos conservatively and retire completed or inaccessible records
• cover landing, resolution, legacy tracking, repeated-run cleanup, and unrelated-flag safety cases

Testing

• uv run pytest -q tests/rules/test_not_landed.py tests/test_bzcleaner.py tests/test_db.py
• uv run pre-commit run --files bugbot/rules/not_landed.py tests/rules/test_not_landed.py

Checklist

• Type annotations added to new functions
• Docs added to functions touched in main classes
• Dry-run produced the expected results
• The to-be-announced tag added if this is worth announcing