Improve naming of cluster-wide k8s resources

[jalaziz]

The operator helm chart currently installs cluster-wide resources with names like:

• manager-role
• metrics-reader
• proxy-role
• manager-rolebinding
• mutating-webhook-configuration

These names are problematic because they are not namespaced and can easily class with roles and other resources defined by the cluster admin.

A common convention to avoid this issue is to prefix cluster wide resource names with a formance- prefix.