test(http2): ensure websocket upgrade resumes queued requests

[trivikr]

This relates to...

Refs: #5131

Rationale

This was fixed in #5090, but I'd used an older state of main for generating bug report

Changes

Adds regression coverage for HTTP/2 WebSocket upgrades resuming queued requests.

Features

N/A

Bug Fixes

N/A

Breaking Changes and Deprecations

N/A

Status

• I have read and agreed to the Developer's Certificate of Origin
• Tested
• Benchmarked (optional)
• Documented
• Review ready
• In review
• Merge ready

Assisted-by: openai:gpt-5.5

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.13%. Comparing base (9a6e313) to head (b365e91).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5132      +/-   ##
==========================================
- Coverage   93.14%   93.13%   -0.01%     
==========================================
  Files         110      110              
  Lines       36117    36117              
==========================================
- Hits        33642    33639       -3     
- Misses       2475     2478       +3     

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