stream: remove transform-writer handling in pipeTo #7725

Job	Run time
Build slim tarball	1m 23s
aarch64-linux: Cache V8 build	22s
aarch64-darwin: with shared libraries	27m 33s
x86_64-linux: with shared libraries	28m 14s
x86_64-darwin: with shared libraries	42m 15s
aarch64-linux: with shared boringssl-0.20260508.0	24m 48s
aarch64-linux: with shared openssl-4.0.0	23m 56s
aarch64-linux: with shared openssl-3.6.2	25m 0s
aarch64-linux: with shared openssl-1.1.1w	23m 37s
aarch64-linux: with shared openssl-3.0.20	23m 46s
aarch64-linux: with shared openssl-3.5.6	24m 46s
	4h 5m 40s

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