feat: strong consistency variant for informer list and byIndex #6930

Job	Run time
sample_operators_tests (sample-operators/tomcat-operator)	2m 47s
sample_operators_tests (sample-operators/webpage)	2m 56s
sample_operators_tests (sample-operators/leader-election)	3m 19s
sample_operators_tests (sample-operators/metrics-processing)	7m 55s
sample_operators_tests (sample-operators/mysql-schema)	2m 46s
	19m 43s

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