[v12.x backport] http2: make HTTP2ServerResponse more streams compliant
HTTP2ServerResponse.write would behave differently than both http1 and streams. This PR makes it more compliant with stream.Writable behaviour.
PR-URL: #30964 Refs: #29529 (closed)
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