fix: Clear EndpointStatuses for PodMonitoring without endpoints #2958

Job	Run time
e2e-testruns	1m 14s
conform	18s
bin	6m 1s
golangci-lint	1m 2s
test	5m 18s
test-export-gcm	2m 0s
test-script-gcm	1m 2s
validate	6m 19s
e2e-test (^TestAlertmanager$)	5m 50s
e2e-test (^TestTLS$)	9m 44s
e2e-test (^TestBasicAuthNoPassword$)	9m 57s
e2e-test (^TestBasicAuthNoUsername$)	9m 52s
e2e-test (^TestBasicAuth$)	9m 51s
e2e-test (^TestAuthNoCredentials$)	10m 19s
e2e-test (^TestAuth$)	11m 9s
e2e-test (^TestOAuth2NoSecret$)	10m 4s
e2e-test (^TestOAuth2$)	11m 17s
e2e-test (^TestCollectorPodMonitoring$)	7m 17s
e2e-test (^TestCollectorClusterPodMonitoring$)	7m 26s
e2e-test (^TestCollectorKubeletScraping$)	5m 51s
e2e-test (^TestRuleEvaluatorNoCompression$)	6m 4s
e2e-test (^TestRuleEvaluatorGzipCompression$)	6m 5s
e2e-test (^TestWebhooksNoRBAC$)	5m 49s
	2h 29m 49s

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