Add a standardised set of labels on all resources

[olemarkus]

This PR will use the manifest remap functionality to add a standardised set of labels to all manifests.

I think this one is useful in many ways:

1. it ensures the addon selector is actually available on all resources and that they are set correctly (which was not the case)
2. it makes it easy for users to see what comes from kOps and what came from elsewhere
3. it makes it easy to see what version of an addon was installed
4. further down the line we could implement some naïve "delete all resources that has the managed-by label and a lower addon version"
5. we could implement addon deletion functionality into channels that users could use to remove addons (or "vendor" that into kOps CLI)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hakman

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