Add missing label servicemonitor #6553

Job	Run time
End-to-end tests e2e on K8s 1.23	5m 44s
End-to-end tests e2e-instrumentation on K8s 1.23	5m 58s
End-to-end tests e2e-upgrade on K8s 1.23	5m 12s
End-to-end tests e2e-autoscale on K8s 1.23	4m 41s
End-to-end tests e2e-pdb on K8s 1.23	4m 32s
End-to-end tests e2e-opampbridge on K8s 1.23	4m 40s
End-to-end tests e2e-targetallocator on K8s 1.23	5m 28s
End-to-end tests e2e-prometheuscr on K8s 1.23	9m 36s
End-to-end tests e2e-multi-instrumentation on K8s 1.23	5m 43s
End-to-end tests e2e on K8s 1.29	5m 59s
End-to-end tests e2e-instrumentation on K8s 1.29	6m 4s
End-to-end tests e2e-upgrade on K8s 1.29	5m 5s
End-to-end tests e2e-autoscale on K8s 1.29	4m 40s
End-to-end tests e2e-pdb on K8s 1.29	4m 46s
End-to-end tests e2e-opampbridge on K8s 1.29	4m 51s
End-to-end tests e2e-targetallocator on K8s 1.29	5m 47s
End-to-end tests e2e-prometheuscr on K8s 1.29	9m 48s
End-to-end tests e2e-multi-instrumentation on K8s 1.29	5m 46s
e2e-tests-check	1s
	1h 44m 21s

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