test: retry crashed cache-test workers once

[trivikr]

This relates to...

Refs: #5199

Rationale

test:cache-tests can intermittently fail when a worker process exits from a native/runtime crash, such as Windows exit code 3221226505. Retrying once lets transient worker crashes recover while preserving normal test failures.

Changes

• Retry a crashed cache-tests worker once.
• Keep regular test failures, such as exit code 1, failing without retry.

Features

N/A

Bug Fixes

N/A

Breaking Changes and Deprecations

N/A

Status

• I have read and agreed to the Developer's Certificate of Origin
• Tested
• Benchmarked (optional)
• Documented
• Review ready
• In review
• Merge ready

Assisted-by: openai:gpt-5.5

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.25%. Comparing base (df5ded9) to head (696668b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5294      +/-   ##
==========================================
- Coverage   93.26%   93.25%   -0.01%     
==========================================
  Files         110      110              
  Lines       36547    36547              
==========================================
- Hits        34085    34082       -3     
- Misses       2462     2465       +3     

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[mcollina]

lgtm