fix: publish undici:client:sendHeaders message on H2 (#3921) #15702

Job	Run time
dependency-review	0s
Lint	40s
Fuzzing	3m 37s
Test with Node.js 20 compiled --without-intl	4m 59s
Test with SQLite enabled	39s
Test with Node.js 22 compiled --without-intl	4m 7s
Test with Node.js 23 compiled --without-intl	4m 19s
Test TypeScript types	40s
test (20, macos-latest) / Test with Node.js 20 on macos-latest	5m 33s
test (20, ubuntu-latest) / Test with Node.js 20 on ubuntu-latest	3m 40s
test (20, windows-latest) / Test with Node.js 20 on windows-latest	4m 53s
test (22, macos-latest) / Test with Node.js 22 on macos-latest	3m 14s
test (22, ubuntu-latest) / Test with Node.js 22 on ubuntu-latest	4m 5s
test (22, windows-latest) / Test with Node.js 22 on windows-latest	5m 16s
test (23, macos-latest) / Test with Node.js 23 on macos-latest	3m 13s
test (23, ubuntu-latest) / Test with Node.js 23 on ubuntu-latest	3m 24s
test (23, windows-latest) / Test with Node.js 23 on windows-latest	4m 31s
automerge	0s
	56m 50s

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