improve: GenericRetry does not provide mutable singleton instance (#2… #5522

Job	Run time
sample_operators_tests (sample-operators/tomcat-operator)	2m 48s
sample_operators_tests (sample-operators/leader-election)	3m 25s
sample_operators_tests (sample-operators/webpage)	3m 38s
sample_operators_tests (sample-operators/mysql-schema)	3m 30s
	13m 21s

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