Add scrape_samples_scraped to all metric sources #586

Job	Run time
List tests	3s
Integration Test (annotation-autodiscovery)	3m 8s
Integration Test (auth)	3m 44s
Integration Test (auto-instrumentation)	2m 50s
Integration Test (cluster-monitoring)	3m 9s
Integration Test (control-plane-monitoring)	3m 49s
Integration Test (integration-cert-manager)	2m 6s
Integration Test (integration-grafana)	3m 5s
Integration Test (integration-loki)	3m 34s
Integration Test (integration-mysql)	3m 4s
Integration Test (profiling)	2m 6s
Integration Test (prometheus-io-annotations)	3m 5s
Integration Test (sharded-kube-state-metrics)	3m 21s
Integration Test (statsd)	2m 37s
	39m 41s

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