http2: run Http2ServerResponse.end's callback after 'finish' event is emitted
Refs: https://github.com/nodejs/node/issues/29829
fixup: don't check for w.end
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines