http2: validate non-link headers in writeEarlyHints #6666

Job	Run time
Build slim tarball	2m 0s
x86_64-darwin: with shared libraries	45s
aarch64-darwin: with shared libraries	58s
x86_64-linux: with shared libraries	42s
aarch64-linux: Cache V8 build	25s
aarch64-linux: with shared ${{ matrix.openssl.name }}	1s
	4m 51s

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