stream: destroy Duplex.from async function on early return

[ac-mmi]

When Duplex.from(asyncFn) is given an AsyncFunction that returns without consuming its async-iterable input, the duplex can remain unfinished, causing pipeline() to hang and preventing the upstream Readable from being destroyed.

Track whether writable final() has started. If the AsyncFunction resolves successfully before final(), destroy the duplex so that pipeline cleanup can propagate upstream.

The change is scoped to the AsyncFunction path and does not modify the shared fromAsyncGen() / async-generator transform behavior.

Fixes: #55077

[nodejs-github-bot]

Review requested:

• @nodejs/streams

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.16%. Comparing base (b805fb5) to head (ebf0fde).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #65963      +/-   ##
==========================================
- Coverage   90.17%   90.16%   -0.02%     
==========================================
  Files         771      771              
  Lines      265489   265498       +9     
  Branches    50471    50483      +12     
==========================================
- Hits       239405   239377      -28     
- Misses      17042    17051       +9     
- Partials     9042     9070      +28     

Files with missing lines	Coverage Δ
lib/internal/streams/duplexify.js	96.98% <100.00%> (+0.06%)	⬆️

... and 27 files with indirect coverage changes

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