feat: metricsV2 + oTel + prometheus sample and Grafana dashboard #6488

Job	Run time
sample_operators_tests (sample-operators/leader-election)	3m 36s
sample_operators_tests (sample-operators/webpage)	3m 11s
sample_operators_tests (sample-operators/metrics-processing)	7m 0s
sample_operators_tests (sample-operators/mysql-schema)	2m 48s
sample_operators_tests (sample-operators/tomcat-operator)	3m 2s
	19m 37s

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