Flush receive batch before path lookup

[Guillaume Hetier (guhetier)]

Description

QuicConnGetPathForPacket mutate the Path array, potentially invalidating any pointer to a path.
This rearranges the receive batching loop to ensure a pointer to a path is never carried accros a call to QuicConnGetPathForPacket.

• Flushes the current receive batch before looking up a packet from a different path.
• Path matching is done without mutating the path array using QuicPathMatchPacket.

Testing

CI and local test run

Documentation

No documentation impact.

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.34%. Comparing base (fb6595d) to head (7e5c632).

Files with missing lines	Patch %	Lines
src/core/connection.c	62.50%	3 Missing ⚠️

❌ Your patch check has failed because the patch coverage (75.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@                        Coverage Diff                         @@
##           guhetier/refactor_network_path    #6271      +/-   ##
==================================================================
+ Coverage                           84.30%   85.34%   +1.03%     
==================================================================
  Files                                  60       60              
  Lines                               19005    19008       +3     
==================================================================
+ Hits                                16022    16222     +200     
+ Misses                               2983     2786     -197     

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