[Operator] Automate Downstream OLM bundle generation

Currently the DG and Infinispan bundles are defined independently, which means that whenever there's a change to the CRDs or RBAC permissions, a manual sync between upstream and downstream is necessary. Often this step gets missed, resulting in delays with QE as they encounter trivial issues that require a PR to the DG bundle and a respin.

To avoid these issues, we should automate this syncing of resources so that the downstream bundle is automatically generated using the upstream sources.

The approximate process to do this is:

1. git clone http://github.com/infinispan/infinispan-operator
2. Replace config/manifests/bases/infinispan-operator.clusterserviceversion.yaml with the downstream equivalent
3. kustomize build config/manifests | operator-sdk generate bundle -q --overwrite --version <version> --bundle-channels <bundle-channels> --default-channel <default channel>
4. operator-sdk bundle validate ./bundle