docs: document annotation-based dependent resource configuration #5197

Job	Run time
sample_operators_tests (sample-operators/leader-election)	3m 23s
sample_operators_tests (sample-operators/mysql-schema)	2m 39s
sample_operators_tests (sample-operators/webpage)	4m 12s
sample_operators_tests (sample-operators/tomcat-operator)	2m 42s
	12m 56s

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