improve: config providers for yaml and properties logs only warning on missing file #6657

Job	Run time
sample_operators_tests (sample-operators/mysql-schema)	2m 48s
sample_operators_tests (sample-operators/tomcat-operator)	2m 59s
sample_operators_tests (sample-operators/metrics-processing)	7m 22s
sample_operators_tests (sample-operators/leader-election)	3m 16s
sample_operators_tests (sample-operators/webpage)	3m 4s
	19m 29s

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