Prevent installing/upgrade for a namespace when we detect an installation in another namespace #381
Description
From #379
We might want to handle the case of:
- install release 24.11 with operator_namespace = "ns1"
- install/upgrade release 25.3 with operator_namespace = "ns2"
Because:
- The CRDs are cluster scopes, so they would be overwritten, but...
- The operators in the old NS will remain.
I'm fine with us only supporting upgrading in the same namespace (moving namespaces should probably be an uninstall and install). So I guess we'd just need to search for operators in any namespace (labels might be the safest way for detecting).