ci: retry flaky tests on Windows Node.js 24

[trivikr]

This relates to...

Refs: #5177

Rationale

Most of the tracked flaky CI failures are on Windows with Node.js 24. This adds a single retry for those CI test failures only, without changing behavior for other platforms or Node.js versions.

Changes

• Add one retry for npm test scripts on GitHub Actions when running on Windows with Node.js 24.
• Keep the retry scoped through the Windows npm script shell setup so existing CI test commands do not need to change.

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

[trivikr]

Setting this to draft, and will keep rebasing for some days.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.25%. Comparing base (df5ded9) to head (7aef4aa).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5295      +/-   ##
==========================================
- 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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