[minor] Generic add-on for non-shared clusters

[boonware]

MASCORE-5932

Description

• Installs a CR of kind GenericAddon for the "non-shared cluster add-on" if the cluster is flagged as being non-shared. The CRD is within the ibm-mas operator so the CR lives within the ibm-mas-suite app.
• Although the "non-shared cluster add-on" is associated with a specific MAS instance, the property is_non_shared_cluster should be defined under cluster config as shown below. This facilitates future automation improvements whereby deployments to clusters with this flag set to "true" can be blocked if they already contain an instance.

cluster:
   is_non_shared_cluster: "true"