perf(worker): Cache flag reports and optimize comparison totals

[sentry]

Fixes WORKER-PFZ. The issue was that: Flag.totals property creates new filtered reports, triggering repeated database queries for each flag in a loop.

• Implemented caching for the Flag.report property to avoid redundant filtering operations.
• Refactored compute_comparison_for_commit_and_pull to pre-fetch base_report_flags and diff once before iterating through flags.
• Updated get_flag_comparison_totals to accept pre-fetched head_report_flags, base_report_flags, and diff as arguments, reducing repeated calls and lookups.

This fix was generated by Seer in Sentry, triggered by Tom Hu. 👁️ Run ID: 13349039

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[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.25%. Comparing base (43f5168) to head (5e3a93f).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #822   +/-   ##
=======================================
  Coverage   92.25%   92.25%           
=======================================
  Files        1306     1306           
  Lines       48013    48017    +4     
  Branches     1636     1637    +1     
=======================================
+ Hits        44295    44299    +4     
  Misses       3407     3407           
  Partials      311      311           

Flag	Coverage Δ
apiunit	96.35% <ø> (ø)
sharedintegration	36.90% <25.00%> (-0.01%)	⬇️
sharedunit	84.90% <100.00%> (+<0.01%)	⬆️
workerintegration	58.54% <0.00%> (-0.01%)	⬇️
workerunit	90.39% <100.00%> (+<0.01%)	⬆️

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[codecov-notifications]

Codecov Report

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

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[codspeed-hq]

Merging this PR will not alter performance

✅ 9 untouched benchmarks

---

_{Comparing seer/perf/cache-flag-reports-comparison (5e3a93f) with main (e38e122)¹}

Footnotes

1. No successful run was found on main (43f5168) during the generation of this report, so e38e122 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩