stream: more iter streams fixes

[jasnell]

Another round of streams/iter fixes.

Builds on: #66028 ... The first four commits are from that PR. This will remain a draft until that one lands

[nodejs-github-bot]

Review requested:

• @nodejs/streams

[codecov]

Codecov Report

❌ Patch coverage is 89.54635% with 53 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.22%. Comparing base (c081d10) to head (195c895).

Files with missing lines	Patch %	Lines
lib/internal/streams/iter/from.js	86.25%	32 Missing and 4 partials ⚠️
lib/internal/streams/iter/pull.js	88.23%	6 Missing ⚠️
lib/internal/streams/iter/broadcast.js	92.53%	4 Missing and 1 partial ⚠️
lib/internal/streams/iter/share.js	93.87%	3 Missing ⚠️
lib/internal/streams/iter/utils.js	93.61%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #66030      +/-   ##
==========================================
- Coverage   90.22%   90.22%   -0.01%     
==========================================
  Files         787      787              
  Lines      270307   270614     +307     
  Branches    51726    51806      +80     
==========================================
+ Hits       243890   244166     +276     
- Misses      16899    16920      +21     
- Partials     9518     9528      +10     

Files with missing lines	Coverage Δ
lib/internal/streams/iter/consumers.js	97.09% <100.00%> (+0.14%)	⬆️
lib/internal/streams/iter/duplex.js	97.47% <100.00%> (+0.25%)	⬆️
lib/internal/streams/iter/share.js	89.42% <93.87%> (+1.62%)	⬆️
lib/internal/streams/iter/utils.js	97.04% <93.61%> (-1.36%)	⬇️
lib/internal/streams/iter/broadcast.js	90.50% <92.53%> (+0.31%)	⬆️
lib/internal/streams/iter/pull.js	83.82% <88.23%> (+0.06%)	⬆️
lib/internal/streams/iter/from.js	87.99% <86.25%> (-0.85%)	⬇️

... and 24 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[panva]

Review Asssisted-by: Codex

[panva]

Source exhaustion does not mean all consumers have finished. This removes the factory abort listener as soon as the fastest consumer reaches the end, while slower consumers can still have buffered data.

For example, create share('x', { signal }) with two consumers, exhaust the first, then abort. The second consumer's next() now returns 'x' instead of rejecting with the abort reason. Please retain the listener until the remaining active consumers finish, and add that case to the signal lifetime test.