[Fix-16900][api] fix when the copied workflow, the logical node switch loses the flow relationship #18921

Job	Run time
Backend-Path-Filter	7s
Backend-Build (8)	11m 53s
Backend-Build (11)	10m 18s
schema-check-with-mysql-3.1.9	1m 15s
cluster-test-mysql-with-zookeeper-registry	3m 19s
schema-check-with-postgresql-3.1.9	53s
cluster-test-mysql-with-mysql-registry	3m 5s
schema-check-with-mysql-3.2.0	1m 54s
cluster-test-postgresql-zookeeper-registry	3m 1s
schema-check-with-postgresql-3.2.0	1m 33s
cluster-test-postgresql-with-postgresql-registry	2m 59s
Build	1s
	40m 18s

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