docs: comment to clarify SSA usage in CreateOnlyIfNotExistingDependentWithSSAIT #5501

Job	Run time
sample_operators_tests (sample-operators/mysql-schema)	2m 36s
sample_operators_tests (sample-operators/leader-election)	3m 4s
sample_operators_tests (sample-operators/tomcat-operator)	3m 14s
sample_operators_tests (sample-operators/webpage)	3m 26s
	12m 20s

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