Update network-services-operator to be multi-cluster aware

[joshlreese]

Today, an instance of the operator is deployed for each Datum Project to manage only resources for that project. In an effort to make this more efficient, we would like to make the operator multi-cluster aware, allowing a single instance to serve multiple projects.

A substantial amount of effort has been put into bringing this capability directly into the controller-runtime library, tracked in kubernetes-sigs/controller-runtime#2746, which has evolved into the multicluster-runtime library.

We should explore using this library and participating in its evolution, as the project goals are aligned with our own.