Fixing WATCH_NAMESPACE env variable handling for single namespace val… #6526

Job	Run time
End-to-end tests e2e on K8s 1.23	10m 57s
End-to-end tests e2e-instrumentation on K8s 1.23	6m 35s
End-to-end tests e2e-upgrade on K8s 1.23	5m 26s
End-to-end tests e2e-autoscale on K8s 1.23	5m 25s
End-to-end tests e2e-pdb on K8s 1.23	4m 52s
End-to-end tests e2e-opampbridge on K8s 1.23	5m 4s
End-to-end tests e2e-prometheuscr on K8s 1.23	5m 13s
End-to-end tests e2e-multi-instrumentation on K8s 1.23	6m 9s
End-to-end tests e2e on K8s 1.29	5m 40s
End-to-end tests e2e-instrumentation on K8s 1.29	5m 49s
End-to-end tests e2e-upgrade on K8s 1.29	5m 25s
End-to-end tests e2e-autoscale on K8s 1.29	4m 55s
End-to-end tests e2e-pdb on K8s 1.29	4m 33s
End-to-end tests e2e-opampbridge on K8s 1.29	5m 5s
End-to-end tests e2e-prometheuscr on K8s 1.29	5m 25s
End-to-end tests e2e-multi-instrumentation on K8s 1.29	5m 38s
e2e-tests-check	1s
	1h 32m 12s

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