Fix: Configdump deployment on OpenShift

[skabashnyuk]

What does this PR do?

• Fixed incorrect label configuration. Replaced CM_LABELS with CONFIG_BUMP_LABELS
• Added POD_NAME that is needed for main.go:leader.Become(context.Background(), controllerName) initialization
• Added pod permissions (we can minimize this list later) for correct main.go:manager.New initialization`
• Disabled metrics to avoid port conflicts manager.Options{MetricsBindAddress: "0", Namespace: namespace}
• Added labels to configmap example

What issues does this PR fix or reference?

Fixes eclipse-che/che#17567

[sparkoo]

I would consider moving the yaml content to extra file (deployment_example.yaml ?) and link it from README.md. It would be easier to copy/paste, reference, etc...

some additional questions