fix: close streams concurrently

[richard-ramos]

No description provided.

[Copilot]

Pull request overview

This PR optimizes the QuicSession.close() method by changing from sequential to concurrent stream closing. The change improves shutdown performance by allowing all streams in a session to close in parallel rather than waiting for each one to complete before starting the next.

Key changes:

• Replaced sequential for loop with concurrent allFutures for closing multiple streams
• Maintained proper error isolation using noCancel wrapper

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.94%. Comparing base (f33f064) to head (00a851c).
⚠️ Report is 2 commits behind head on lsquic.

Additional details and impacted files

@@            Coverage Diff             @@
##           lsquic    #1966      +/-   ##
==========================================
+ Coverage   71.89%   71.94%   +0.04%     
==========================================
  Files         140      140              
  Lines       17854    17824      -30     
  Branches       19       19              
==========================================
- Hits        12836    12823      -13     
+ Misses       5018     5001      -17     

Files with missing lines	Coverage Δ
libp2p/transports/quictransport.nim	91.71% <100.00%> (-0.06%)	⬇️

... and 63 files with indirect coverage changes

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