Description of the problem:
Observability Deployed - only the local cluster shows up in grafana.
observability-addon is not visibile / deployed to managed cluster


```
2022-06-21T15:57:36.857Z	ERROR	controller_placementrule	Failed to create manifestwork	{“error”: “admission webhook \“manifestworkvalidators.admission.work.open-cluster-management.io\” denied the request: the size of manifests is 52739 bytes which exceeds the 50k limit”}
```
This affects ALL managed clusters in this env (which uses RHV and bare metal clusters)

Obersvability is thus not working at all, hence sev=high


Release version:
RHACM 2.5.0

Operator snapshot version:
egistry.redhat.io/rhacm2/multicluster-observability-rhel8-operator@sha256:dd888f81c33bd51608b54fef35bd63de48ea0eb60502be8c497e1a63482b9a57

OCP version:
4.9.36

Browser Info:
Chrome

Additional info:
hub and managed cluster are on Red Hat VPN - contact me on slack or gchat to get access and see yourself.


observability operator log snippet.

2022-06-21T17:54:04.705Z	INFO	controller_placementrule	Monitoring operator should be installed in cluster	{"cluster_name": "stormshift-ocp10", "request.name": "stormshift-ocp10", "request.namespace": ""}
2022-06-21T17:54:04.705Z	INFO	controller_placementrule	observabilityaddon already existed/unchanged	{"namespace": "stormshift-ocp10"}
2022-06-21T17:54:04.705Z	INFO	controller_placementrule	clusterrolebinding endpoint-observability-mco-rolebinding already existed/unchanged	{"namespace": "stormshift-ocp10"}
2022-06-21T17:54:04.705Z	INFO	controller_placementrule	rolebinding endpoint-observability-res-rolebinding already existed/unchanged	{"namespace": "stormshift-ocp10"}
2022-06-21T17:54:04.713Z	INFO	controller_placementrule	Creating manifestwork	{"namespace": "stormshift-ocp10", "name": "stormshift-ocp10-observability"}
2022-06-21T17:54:04.745Z	ERROR	controller_placementrule	Failed to create manifestwork	{"namespace": "stormshift-ocp10", "name": "stormshift-ocp10-observability", "error": "admission webhook \"manifestworkvalidators.admission.work.open-cluster-management.io\" denied the request: the size of manifests is 52750 bytes which exceeds the 50k limit"}
github.com/stolostron/multicluster-observability-operator/operators/multiclusterobservability/controllers/placementrule.createManagedClusterRes
	/remote-source/app/operators/multiclusterobservability/controllers/placementrule/placementrule_controller.go:431
github.com/stolostron/multicluster-observability-operator/operators/multiclusterobservability/controllers/placementrule.createAllRelatedRes
	/remote-source/app/operators/multiclusterobservability/controllers/placementrule/placementrule_controller.go:351
github.com/stolostron/multicluster-observability-operator/operators/multiclusterobservability/controllers/placementrule.(*PlacementRuleReconciler).Reconcile
	/remote-source/app/operators/multiclusterobservability/controllers/placementrule/placementrule_controller.go:158
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile
	/remote-source/app/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:114
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler
	/remote-source/app/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:311