stream: fix sizeAlgorithm validation in WritableStream

[daeyeon]

sizeAlgorithm seems to be set to undefined when the stream is closed as well. This patch adds the unchecked closed state to the assertion.

https://streams.spec.whatwg.org/#writable-stream-default-controller-process-close

WritableStreamDefaultControllerProcessClose(controller) performs the following steps:

6. Perform ! WritableStreamDefaultControllerClearAlgorithms(controller). <- Set strategySizeAlgorithm to undefined.
   7.1 Perform ! WritableStreamFinishInFlightClose(stream). <- Set stream.[[state]] to "closed".

Fixes: #57272
Refs: #56067

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.24%. Comparing base (6b0af17) to head (6dd78fb).
Report is 16 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #57280   +/-   ##
=======================================
  Coverage   90.24%   90.24%           
=======================================
  Files         630      630           
  Lines      184908   184910    +2     
  Branches    36181    36188    +7     
=======================================
+ Hits       166874   166879    +5     
- Misses      11061    11064    +3     
+ Partials     6973     6967    -6     

Files with missing lines	Coverage Δ
lib/internal/webstreams/writablestream.js	99.85% <100.00%> (+<0.01%)	⬆️

... and 33 files with indirect coverage changes

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/65535/

[gurgunday]

lgtm

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/65560/