Use multi-arch origin-oauth-proxy image

During upgrade from ACM2.11->ACM2.12 for a (currently not fully
understood reason) we use the proxy image from the base templates. This
seem to happen only for a short while, on later reconciles we appear get
the correct image from the OCP imagestream.

The image previously set in the base template were amd64 only, causing
the pods to crash on any other architecture. From rbac-query-proxy and
Grafana it eventually resolves, however alertmanager uses a stateful set
and gets stuck due the known Kubernetes issue described here:
https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/#forced-rollback

Ideally we'd never want to use these images, but meanwhile this should
at least ensure we don't crash and leave a unhealthy stateful set for
alertmanager.

Signed-off-by: Jacob Baungard Hansen <jacobbaungard@redhat.com>

operators/multiclusterobservability/manifests/base/alertmanager/alertmanager-statefulset.yaml

@@ -125,7 +125,7 @@ spec:
         - --skip-provider-button=true
         - --openshift-ca=/etc/pki/tls/cert.pem
         - --openshift-ca=/var/run/secrets/kubernetes.io/serviceaccount/ca.crt
-        image: quay.io/stolostron/origin-oauth-proxy:4.5
+        image: quay.io/stolostron/origin-oauth-proxy:4.16
         imagePullPolicy: IfNotPresent
         name: alertmanager-proxy
         ports:

operators/multiclusterobservability/manifests/base/grafana/deployment.yaml

@@ -101,7 +101,7 @@ spec:
               mountPath: /etc/tls/private
             - mountPath: /etc/proxy/secrets
               name: cookie-secret
-          image: quay.io/stolostron/origin-oauth-proxy:4.5
+          image: quay.io/stolostron/origin-oauth-proxy:4.16
           args:
             - '--provider=openshift'
             - '--upstream=http://localhost:3001'

operators/multiclusterobservability/manifests/base/proxy/deployment.yaml

@@ -91,7 +91,7 @@ spec:
             - --skip-provider-button=true
             - --openshift-ca=/etc/pki/tls/cert.pem
             - --openshift-ca=/var/run/secrets/kubernetes.io/serviceaccount/ca.crt
-          image: quay.io/stolostron/origin-oauth-proxy:4.5
+          image: quay.io/stolostron/origin-oauth-proxy:4.16
           imagePullPolicy: IfNotPresent
           name: oauth-proxy
           ports: