http2: force through RST_STREAM in destroy
If still needed, force through RST_STREAM in Http2Stream#destroy calls, so that nghttp2 can wrap up properly and doesn't continue trying to read & write data to the stream.
Fixes: https://github.com/nodejs/node/issues/21008
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines