improve: GenericRetry does not provide mutable singleton instance #5521

Job	Run time
sample_operators_tests (sample-operators/mysql-schema)	2m 42s
sample_operators_tests (sample-operators/tomcat-operator)	3m 24s
sample_operators_tests (sample-operators/webpage)	3m 18s
sample_operators_tests (sample-operators/leader-election)	3m 43s
	13m 7s

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