fix: register event sources when dependents are marked for deletion #6672

Job	Run time
sample_operators_tests (sample-operators/tomcat-operator)	3m 28s
sample_operators_tests (sample-operators/webpage)	3m 37s
sample_operators_tests (sample-operators/leader-election)	3m 20s
sample_operators_tests (sample-operators/mysql-schema)	2m 40s
sample_operators_tests (sample-operators/metrics-processing)	7m 32s
	20m 37s

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