perf(worker): Cache commit objects for Pull and CommitStatus

[sentry]

Fixes WORKER-Y7F. The issue was that: Multiple notification context builders repeatedly query the same commit objects, causing an N+1 database query pattern within a Redis-locked task.

• Utilizes @cached_property for base_commit in the CommitStatus context to prevent redundant database queries.
• Implements manual caching for get_head_commit and get_comparedto_commit methods on the Pull model to avoid repeated database lookups for the same commit objects.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 13304620

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Note

Low Risk
Low risk performance change that only memoizes commit lookups within a model/context instance; main risk is subtle staleness if the same Pull object is reused after head/compared_to changes in-memory.

Overview
Reduces N+1-style database access during bundle analysis notifications by caching commit objects.

Pull.get_head_commit() and Pull.get_comparedto_commit() now memoize the fetched Commit on the model instance, and CommitStatusNotificationContext.base_commit is switched to @cached_property to avoid repeated base-commit resolution within a single notification build.

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[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.25%. Comparing base (8c332b1) to head (09195a4).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #810   +/-   ##
=======================================
  Coverage   92.25%   92.25%           
=======================================
  Files        1306     1306           
  Lines       48004    48009    +5     
  Branches     1636     1636           
=======================================
+ Hits        44286    44291    +5     
  Misses       3407     3407           
  Partials      311      311           

Flag	Coverage Δ
workerintegration	58.59% <100.00%> (+0.01%)	⬆️
workerunit	90.39% <100.00%> (+<0.01%)	⬆️

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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