fix(jacoco): handle missing complexity counter attributes

[sentry]

Updates the JaCoCo parser in apps/worker/services/report/languages/jacoco.py to defensively access 'missed' and 'covered' attributes for COMPLEXITY counters. This prevents a KeyError when these attributes are legitimately absent in JaCoCo XML reports (e.g., for abstract methods), aligning with existing robust parsing patterns in the file.

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Fixes WORKER-YYK

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[thomasrockhu-codecov]

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✅ Risk: LOW

This PR defensively accesses the missed and covered attributes of JaCoCo COMPLEXITY counters via .get(..., "0"), preventing a KeyError when those attributes are legitimately absent (e.g. abstract methods). The change is minimal, correct, and mirrors the existing .get("line", 0) pattern already used in the same function.

No issues found above the confidence threshold.

[codecov-notifications]

Codecov Report

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

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.63%. Comparing base (17e0f08) to head (11bb676).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2200   +/-   ##
=======================================
  Coverage   91.63%   91.63%           
=======================================
  Files        1337     1337           
  Lines       53262    53262           
  Branches     1647     1647           
=======================================
  Hits        48805    48805           
  Misses       4136     4136           
  Partials      321      321           

Flag	Coverage Δ
workerintegration	58.49% <0.00%> (ø)
workerunit	90.55% <100.00%> (ø)

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