Add missing label servicemonitor #6574

Job	Run time
End-to-end tests e2e on K8s 1.23	5m 35s
End-to-end tests e2e-instrumentation on K8s 1.23	5m 33s
End-to-end tests e2e-upgrade on K8s 1.23	5m 6s
End-to-end tests e2e-autoscale on K8s 1.23	4m 4s
End-to-end tests e2e-pdb on K8s 1.23	3m 59s
End-to-end tests e2e-opampbridge on K8s 1.23	4m 16s
End-to-end tests e2e-targetallocator on K8s 1.23	5m 17s
End-to-end tests e2e-prometheuscr on K8s 1.23	4m 50s
End-to-end tests e2e-multi-instrumentation on K8s 1.23	5m 31s
End-to-end tests e2e on K8s 1.29	4m 50s
End-to-end tests e2e-instrumentation on K8s 1.29	5m 26s
End-to-end tests e2e-upgrade on K8s 1.29	4m 36s
End-to-end tests e2e-autoscale on K8s 1.29	4m 32s
End-to-end tests e2e-pdb on K8s 1.29	4m 13s
End-to-end tests e2e-opampbridge on K8s 1.29	4m 22s
End-to-end tests e2e-targetallocator on K8s 1.29	5m 43s
End-to-end tests e2e-prometheuscr on K8s 1.29	4m 32s
End-to-end tests e2e-multi-instrumentation on K8s 1.29	5m 12s
e2e-tests-check	1s
	1h 27m 38s

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