fix: reset invalid HTTP/2 sessions

[mcollina]

Summary

• reset cached HTTP/2 client session/context/socket state when session.request() throws ERR_HTTP2_INVALID_SESSION
• requeue the unsent request locally in the HTTP/2 client so it can be sent on a fresh session
• add regression coverage for invalid sessions and server-truncated HTTP/2 sessions

Tests

• npx borp -p "test/http2-invalid-session.js"
• npx borp -p "test/http2-invalid-connection-headers.js"
• npx borp -p "test/http2-*.js"
• npm run lint -- test/http2-invalid-session.js lib/dispatcher/client-h2.js

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.23%. Comparing base (d863782) to head (52c64f0).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5310   +/-   ##
=======================================
  Coverage   93.22%   93.23%           
=======================================
  Files         110      110           
  Lines       36603    36668   +65     
=======================================
+ Hits        34123    34187   +64     
- Misses       2480     2481    +1     

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[metcoder95]

lint seems unhappy