Fire close event for server WebSocket close, with allowHalfOpen opt-out.

[anonrig]

For more information, read the docs pull-request: cloudflare/cloudflare-docs#28887

[codecov-commenter]

Codecov Report

❌ Patch coverage is 89.28571% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.64%. Comparing base (1f0f17f) to head (2afda3e).

Files with missing lines	Patch %	Lines
src/workerd/api/web-socket.c++	89.28%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6197      +/-   ##
==========================================
- Coverage   70.73%   70.64%   -0.09%     
==========================================
  Files         420      420              
  Lines      111371   111390      +19     
  Branches    18349    18353       +4     
==========================================
- Hits        78777    78692      -85     
- Misses      21629    21738     +109     
+ Partials    10965    10960       -5     

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[jasnell]

Overall I'm fine with this approach. I'll do a final review pass once @jp4a50's reviews are addressed but currently not seeing anything else here that would be blocking.

[jp4a50]

Pre-emptively approving on the assumption that the compat flag's enable and disable names are flipped!

[github-actions]

The generated output of @cloudflare/workers-types matches the snapshot in types/generated-snapshot 🎉

[petebacondarwin]

From the point of view of the TS typings.