Revert "stream: make `.destroy()` interact better with write queue"
The reverted commit introduced (or greatly exacerbated) the unreliability of test-stream-pipeline-http2. Would be happy to see a fix, but in absence of that, a revert seems in order.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines