stream: prefer sync iterator in fromSync #8964

Job	Run time
Build slim tarball	1m 10s
aarch64-linux: Cache V8 build	22s
x86_64-linux: with shared libraries / build	32m 48s
x86_64-darwin: with shared libraries / build	36m 13s
aarch64-darwin: with shared libraries / build	28m 32s
aarch64-linux: with shared openssl-1.1.1w / build	25m 14s
aarch64-linux: with shared boringssl-0.20260526.0 / build	26m 9s
aarch64-linux: with shared openssl-3.6.2 / build	27m 7s
aarch64-linux: with shared openssl-3.5.7 / build	25m 15s
aarch64-linux: with shared openssl-4.0.1 / build	26m 11s
aarch64-linux: with shared openssl-3.0.21 / build	26m 37s
	4h 15m 38s

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