fix: race condition on get when add received after informer cache rea… #6641

Job	Run time
sample_operators_tests (sample-operators/webpage)	2m 46s
sample_operators_tests (sample-operators/tomcat-operator)	3m 3s
sample_operators_tests (sample-operators/metrics-processing)	7m 10s
sample_operators_tests (sample-operators/leader-election)	3m 14s
sample_operators_tests (sample-operators/mysql-schema)	2m 36s
	18m 49s

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