feat: field selectors support for InformerEventSource (#2835) #5248

Job	Run time
sample_operators_tests (sample-operators/webpage)	3m 0s
sample_operators_tests (sample-operators/leader-election)	3m 9s
sample_operators_tests (sample-operators/tomcat-operator)	2m 40s
sample_operators_tests (sample-operators/mysql-schema)	2m 42s
	11m 31s

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