stream: fix TransformStream race on cancel with pending write #3770

Job	Run time
Build slim tarball	1m 39s
aarch64-linux: with shared libraries	18m 46s
x86_64-linux: with shared libraries	21m 46s
x86_64-darwin: with shared libraries	25m 33s
aarch64-darwin: with shared libraries	19m 5s
	1h 26m 49s

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