stream: fix ERR_INVALID_STATE when cancelling Readable.toWeb()

[richardscarrott]

When a web ReadableStream returned by Readable.toWeb() is cancelled while the underlying Readable is actively producing data, a pending onData callback can still fire after the controller has been closed and attempt to enqueue a chunk, throwing ERR_INVALID_STATE.

Check wasCanceled in the onData handler and return early to avoid calling controller.enqueue() on a closed controller.

Refs: #54205

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.69%. Comparing base (ed05549) to head (96e546b).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #62773   +/-   ##
=======================================
  Coverage   89.69%   89.69%           
=======================================
  Files         706      706           
  Lines      218127   218144   +17     
  Branches    41734    41743    +9     
=======================================
+ Hits       195651   195669   +18     
+ Misses      14400    14396    -4     
- Partials     8076     8079    +3     

Files with missing lines	Coverage Δ
lib/internal/webstreams/adapters.js	86.61% <100.00%> (+0.01%)	⬆️

... and 41 files with indirect coverage changes

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