Bug-2038705: Migrate the get_commit to pygithub

[moijes12]

Changes Introduced

• Migrate the get_commit method in treeeherder/utils/github.py to use PyGithub object's
• It continues to return a dictionary as we want to compatibility with downstream users - collector.py and ingest.py

Local Testing

• Marginal performance improvement observed in update_changelog. See results below

================= With Changes =========================
root@ac48de19de68:/app# time python manage.py update_changelog 
{"logging.googleapis.com/diagnostic": {"instrumentation_source": [{"name": "python", "version": "3.16.0"}]},"severity": "INFO", "logging.googleapis.com/labels": {"python_logger": "google.cloud.logging_v2.handlers.structured_log"}, "logging.googleapis.com/trace": "", "logging.googleapis.com/spanId": "", "logging.googleapis.com/trace_sampled": false, "logging.googleapis.com/sourceLocation": {"line": 151, "file": "/usr/local/lib/python3.13/site-packages/google/cloud/logging_v2/handlers/structured_log.py", "function": "emit_instrumentation_info"}, "httpRequest": {} }
{"message": "Updating unified changelog (days=1)","severity": "INFO", "logging.googleapis.com/labels": {"python_logger": "treeherder.changelog.tasks"}, "logging.googleapis.com/trace": "", "logging.googleapis.com/spanId": "", "logging.googleapis.com/trace_sampled": false, "logging.googleapis.com/sourceLocation": {"line": 16, "file": "/app/treeherder/changelog/tasks.py", "function": "update_changelog"}, "httpRequest": {} }
{"message": "Found 6 items, 0 existed and 6 where created.","severity": "INFO", "logging.googleapis.com/labels": {"python_logger": "treeherder.changelog.tasks"}, "logging.googleapis.com/trace": "", "logging.googleapis.com/spanId": "", "logging.googleapis.com/trace_sampled": false, "logging.googleapis.com/sourceLocation": {"line": 34, "file": "/app/treeherder/changelog/tasks.py", "function": "update_changelog"}, "httpRequest": {} }

real    0m24.177s
user    0m4.342s
sys     0m0.471s


========================= Master Branch ========================

root@ac48de19de68:/app# time python manage.py update_changelog 
{"logging.googleapis.com/diagnostic": {"instrumentation_source": [{"name": "python", "version": "3.16.0"}]},"severity": "INFO", "logging.googleapis.com/labels": {"python_logger": "google.cloud.logging_v2.handlers.structured_log"}, "logging.googleapis.com/trace": "", "logging.googleapis.com/spanId": "", "logging.googleapis.com/trace_sampled": false, "logging.googleapis.com/sourceLocation": {"line": 151, "file": "/usr/local/lib/python3.13/site-packages/google/cloud/logging_v2/handlers/structured_log.py", "function": "emit_instrumentation_info"}, "httpRequest": {} }
{"message": "Updating unified changelog (days=1)","severity": "INFO", "logging.googleapis.com/labels": {"python_logger": "treeherder.changelog.tasks"}, "logging.googleapis.com/trace": "", "logging.googleapis.com/spanId": "", "logging.googleapis.com/trace_sampled": false, "logging.googleapis.com/sourceLocation": {"line": 16, "file": "/app/treeherder/changelog/tasks.py", "function": "update_changelog"}, "httpRequest": {} }
{"message": "Found 6 items, 0 existed and 6 where created.","severity": "INFO", "logging.googleapis.com/labels": {"python_logger": "treeherder.changelog.tasks"}, "logging.googleapis.com/trace": "", "logging.googleapis.com/spanId": "", "logging.googleapis.com/trace_sampled": false, "logging.googleapis.com/sourceLocation": {"line": 34, "file": "/app/treeherder/changelog/tasks.py", "function": "update_changelog"}, "httpRequest": {} }

real    0m28.431s
user    0m6.320s
sys     0m0.927s

@gmierz @Archaeopteryx

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[moijes12]

@gmierz @Archaeopteryx This PR is now ready for review