stream: port remaining SonicBoom tests for Utf8Stream

[mcollina]

Port the SonicBoom tests that could not be imported directly because they depend on the third-party proxyquire module, along with the maxWriteRetries option they exercise, into the Utf8Stream module.

Adds maxWriteRetries support, which bounds consecutive EAGAIN/EBUSY retry attempts and resets the counter on forward progress, plus drop-event and flush-callback edge-case coverage.

Fixes: #58955

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AI generated, reviewed by me

[nodejs-github-bot]

Review requested:

• @nodejs/streams

[codecov]

Codecov Report

❌ Patch coverage is 77.41935% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.35%. Comparing base (ebef774) to head (919e61f).
⚠️ Report is 112 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/internal/streams/fast-utf8-stream.js	77.41%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #66275      +/-   ##
==========================================
+ Coverage   90.28%   90.35%   +0.06%     
==========================================
  Files         790      789       -1     
  Lines      271642   273521    +1879     
  Branches    51846    52289     +443     
==========================================
+ Hits       245260   247142    +1882     
+ Misses      16889    16837      -52     
- Partials     9493     9542      +49     

Files with missing lines	Coverage Δ
lib/internal/streams/fast-utf8-stream.js	82.59% <77.41%> (+1.72%)	⬆️

... and 96 files with indirect coverage changes

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