streams: simplify `createPromiseCallback` #5224

Job	Run time
Build slim tarball	4m 12s
aarch64-linux: with shared libraries	19m 6s
aarch64-darwin: with shared libraries	20m 57s
x86_64-darwin: with shared libraries	32m 24s
x86_64-linux: with shared libraries	23m 47s
	1h 40m 26s

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