Pipe: Fix async sink handshake backoff #29907

Job	Run time
unit-test (17, windows-latest, datanode)	32m 21s
unit-test (17, ubuntu-latest, others)	19m 20s
unit-test (17, windows-latest, others)	27m 51s
unit-test (17, ubuntu-latest, datanode)	23m 20s
	1h 42m 52s

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