test: fix flaky http2-dispatcher test

[mcollina]

Summary

Fixed flaky Dispatcher#Connect test in test/http2-dispatcher.js that was intermittently failing with ERR_HTTP2_STREAM_ERROR and timing out.

Problem

The test was using response.body.pipe(stream) without proper error handling. When HTTP/2 streams encountered errors (like NGHTTP2_INTERNAL_ERROR), they became uncaught exceptions, causing random test failures and timeouts.

Solution

• Replaced .pipe() with pipeline() for proper error handling
• Added try-catch block around the forward request
• Properly destroys streams on errors to prevent hanging connections

Test Plan

• ✅ Ran test 20+ times consecutively - all passed
• ✅ Pre-commit hooks passed (eslint)

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.86%. Comparing base (f69e47b) to head (e9ff5ce).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4633   +/-   ##
=======================================
  Coverage   92.86%   92.86%           
=======================================
  Files         106      106           
  Lines       33111    33111           
=======================================
  Hits        30747    30747           
  Misses       2364     2364           

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[gurgunday]

lgtm