fix(worker): Handle missing JaCoCo branch attributes in XML parsing

[sentry]

This PR addresses KeyError: 'mb' and similar errors occurring in the JaCoCo XML parser (apps/worker/services/report/languages/jacoco.py).

Problem: The parser was using direct dictionary access (attr['mb'], attr['cb'], attr['ci'], attr['nr']) to retrieve attributes from JaCoCo <line> elements. Some non-standard JaCoCo reports, particularly from an enterprise uploader, omit these branch-related attributes when a line has no branch coverage data. This led to KeyError exceptions, causing report processing to fail.

Solution: The code has been updated to use attr.get() with default values (e.g., attr.get('mb', '0'), attr.get('cb', '0'), attr.get('ci', '0')). Additionally, a guard has been added for the nr (line number) attribute to ensure int() conversion doesn't fail if it's missing, skipping the line if nr is not present.

Impact: This change prevents crashes when processing JaCoCo reports that omit optional branch attributes, ensuring robust parsing for both standard and non-standard JaCoCo outputs. There is no change in behavior for well-formed JaCoCo reports.

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Fixes WORKER-VYP

[codecov-notifications]

Codecov Report

❌ Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
apps/worker/services/report/languages/jacoco.py	91.66%	1 Missing ⚠️

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[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.85%. Comparing base (7fd98bf) to head (7493474).
⚠️ Report is 7 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
apps/worker/services/report/languages/jacoco.py	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1673      +/-   ##
==========================================
- Coverage   91.85%   91.85%   -0.01%     
==========================================
  Files        1329     1329              
  Lines       51550    51556       +6     
  Branches     1647     1647              
==========================================
+ Hits        47352    47357       +5     
- Misses       3877     3878       +1     
  Partials      321      321              

Flag	Coverage Δ
workerintegration	58.59% <0.00%> (-0.03%)	⬇️
workerunit	90.40% <91.66%> (-0.01%)	⬇️

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[thomasrockhu-codecov]

Closing as duplicate Seer effort.

Reason: duplicate missing JaCoCo branch-attributes fix; consolidated into #1879.

Part of a triage pass consolidating overlapping sentry[bot] PRs so review capacity focuses on unique fixes.