stream: reject pending reads on iterator throw

[trivikr]

Fixes: #63554

Stream.push() readable iterators could leave an already pending next()
promise unresolved when iterator.throw() was called.

This updates consumer cancellation handling so pending reads are settled:

• iterator.throw(error) rejects pending reads with error
• iterator.return() resolves pending reads with done: true

---

Assisted-by: openai:gpt-5.5

[nodejs-github-bot]

Review requested:

• @nodejs/streams

[codecov]

Codecov Report

❌ Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.33%. Comparing base (8c495c8) to head (cbf0957).
⚠️ Report is 21 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/internal/streams/iter/push.js	55.55%	4 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #63555 +/- ##
==========================================
- Coverage 90.33% 90.33% -0.01% 
==========================================
Files 730 730 Lines 234362 234371 +9 Branches 43908 43920 +12 ==========================================
+ Hits 211708 211713 +5 - Misses 14376 14387 +11 + Partials 8278 8271 -7 

Files with missing lines	Coverage Δ
lib/internal/streams/iter/push.js	91.57% <55.55%> (-0.44%)	⬇️

... and 45 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/73767/

[nodejs-github-bot]

Landed in 7dbded2