refactor: move path logic for received path response to path

[divagant-martian]

Description

Moves logic about receiving path response to the path state. This helps
simplify the connection logic and have a better separation of concerns

technically this also fixes a bug where we send multiple path open events

Breaking Changes

n/a

Notes & open questions

n/a

[github-actions]

Documentation for this PR has been generated and is available at: https://n0-computer.github.io/quinn/pr/259/docs/iroh_quinn/

Last updated: 2025-12-16T14:56:03Z

[codecov-commenter]

Codecov Report

❌ Patch coverage is 73.80952% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.50%. Comparing base (9cac306) to head (01536ac).

Files with missing lines	Patch %	Lines
quinn-proto/src/connection/paths.rs	71.42%	8 Missing ⚠️
quinn-proto/src/connection/mod.rs	78.57%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #259      +/-   ##
==========================================
- Coverage   76.52%   76.50%   -0.02%     
==========================================
  Files          83       83              
  Lines       23158    23167       +9     
==========================================
+ Hits        17721    17724       +3     
- Misses       5437     5443       +6     

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[dignifiedquire]

very nice