improve: showcase initialized spec deleted when adding finalizer with SSA with same fieldManager #5808

Job	Run time
sample_operators_tests (sample-operators/mysql-schema)	2m 43s
sample_operators_tests (sample-operators/leader-election)	3m 18s
sample_operators_tests (sample-operators/webpage)	3m 7s
sample_operators_tests (sample-operators/tomcat-operator)	3m 12s
	12m 20s

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