Fixing WATCH_NAMESPACE env variable handling for single namespace value #6525

Job	Run time
End-to-end tests e2e on K8s 1.23	5m 48s
End-to-end tests e2e-instrumentation on K8s 1.23	5m 54s
End-to-end tests e2e-upgrade on K8s 1.23	5m 27s
End-to-end tests e2e-autoscale on K8s 1.23	4m 56s
End-to-end tests e2e-pdb on K8s 1.23	4m 29s
End-to-end tests e2e-opampbridge on K8s 1.23	4m 55s
End-to-end tests e2e-prometheuscr on K8s 1.23	5m 0s
End-to-end tests e2e-multi-instrumentation on K8s 1.23	5m 42s
End-to-end tests e2e on K8s 1.29	6m 19s
End-to-end tests e2e-instrumentation on K8s 1.29	6m 37s
End-to-end tests e2e-upgrade on K8s 1.29	5m 10s
End-to-end tests e2e-autoscale on K8s 1.29	4m 46s
End-to-end tests e2e-pdb on K8s 1.29	4m 32s
End-to-end tests e2e-opampbridge on K8s 1.29	4m 42s
End-to-end tests e2e-prometheuscr on K8s 1.29	4m 50s
End-to-end tests e2e-multi-instrumentation on K8s 1.29	6m 12s
e2e-tests-check	1s
	1h 25m 20s

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