Prepare Community Loki Operator Release v0.2.0

Prepare and rollout the next Community Loki Operator release:

1. On the official Kubernets OperatorHub: https://github.com/k8s-operatorhub/community-operators
2. On the official Red Hat Openshift Community Operators Hub: https://github.com/redhat-openshift-ecosystem/community-operators-prod

Developer Notes

1. Both PRs to the target operarhub repositories are executed via the following makefile target

   make operatorhub 

2. Requirements are: curl & gh.
3. Note: The previous release version for the replaces directives is always the clusterserviceversion name, e.g. loki-operator.v0.1.0