fix(http2): record ping failures on the socket

[trivikr]

This relates to...

N/A

Rationale

HTTP/2 ping failures were being recorded on the Client object instead of the underlying socket.

That meant the connection state did not retain the ping error in the place later session/socket shutdown paths expect to read it from.

Changes

Fix the HTTP/2 ping callback to store ping errors on session[kSocket]

Features

N/A

Bug Fixes

• Fix incorrect error recording for HTTP/2 ping failures
• Preserve ping failure state for later close/disconnect handling

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

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.13%. Comparing base (f6c5dda) to head (4f4fa69).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5075      +/-   ##
==========================================
+ Coverage   93.10%   93.13%   +0.03%     
==========================================
  Files         110      110              
  Lines       35799    35799              
==========================================
+ Hits        33329    33342      +13     
+ Misses       2470     2457      -13     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[mcollina]

lgtm