Change multi instrumentation feature gate into command line flag #6616

Job	Run time
End-to-end tests e2e on K8s 1.23	6m 6s
End-to-end tests e2e-instrumentation on K8s 1.23	6m 26s
End-to-end tests e2e-upgrade on K8s 1.23	4m 52s
End-to-end tests e2e-autoscale on K8s 1.23	4m 44s
End-to-end tests e2e-pdb on K8s 1.23	4m 37s
End-to-end tests e2e-opampbridge on K8s 1.23	4m 33s
End-to-end tests e2e-targetallocator on K8s 1.23	5m 58s
End-to-end tests e2e-prometheuscr on K8s 1.23	5m 27s
End-to-end tests e2e-multi-instrumentation on K8s 1.23	6m 14s
End-to-end tests e2e on K8s 1.29	5m 25s
End-to-end tests e2e-instrumentation on K8s 1.29	6m 35s
End-to-end tests e2e-upgrade on K8s 1.29	5m 9s
End-to-end tests e2e-autoscale on K8s 1.29	4m 53s
End-to-end tests e2e-pdb on K8s 1.29	4m 45s
End-to-end tests e2e-opampbridge on K8s 1.29	4m 55s
End-to-end tests e2e-targetallocator on K8s 1.29	5m 53s
End-to-end tests e2e-prometheuscr on K8s 1.29	4m 56s
End-to-end tests e2e-multi-instrumentation on K8s 1.29	6m 15s
e2e-tests-check	2s
	1h 37m 45s

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