server: Preserve the RPC status when a compressed RPC ends before response compressor setup.

[RayanAlsalemi]

Fixes #9313

A compressed RPC can end after the server receives the request headers but before grpc-go sets the response compressor. When that happens, SetSendCompress returns a "headers sent or stream done" error and the server stats report Internal even if the stream was canceled or its deadline expired.

This change records the first status used to close the transport stream. If SetSendCompress runs after the stream is done, it returns that status. If the headers were already sent, or there is no recorded close status, it keeps the existing error.

RELEASE NOTES:

• server: Preserve the RPC status when a compressed RPC ends before response compressor setup.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: RayanAlsalemi / name: Rayan Alsalemi (fe54e06)

[codecov]

Codecov Report

❌ Patch coverage is 84.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.12%. Comparing base (ec03539) to head (3815870).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/transport/http2_server.go	80.00%	2 Missing ⚠️
internal/transport/http_util.go	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9314      +/-   ##
==========================================
- Coverage   83.22%   83.12%   -0.11%     
==========================================
  Files         423      423              
  Lines       35139    35251     +112     
==========================================
+ Hits        29244    29301      +57     
- Misses       4400     4437      +37     
- Partials     1495     1513      +18     

Files with missing lines	Coverage Δ
internal/transport/server_stream.go	96.92% <100.00%> (+0.31%)	⬆️
server.go	83.70% <100.00%> (+0.27%)	⬆️
internal/transport/http2_server.go	90.33% <80.00%> (-0.33%)	⬇️
internal/transport/http_util.go	96.68% <60.00%> (-0.62%)	⬇️

... and 32 files with indirect coverage changes

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[easwars]

@mbissa : I've categorized this PR with a "bug" label. But we should check the behavior of the other language implementations before proceeding with this.

[RayanAlsalemi]

I've updated the PR so the transport records the first close status. If compressor setup runs after the stream is already done, it can return that status directly instead of checking ctx.Err() afterward.