Use controller-runtime to protect metrics endpoint

[zyjjay]

Use the new FilterProvider and SecureServing fields to authenticate and authorize requests to the metrics endpoint

ref: https://issues.redhat.com/browse/ACM-8346

[openshift-ci]

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[zyjjay]

/test test-e2e-grc-framework

[openshift-ci]

@zyjjay: No presubmit jobs available for open-cluster-management-io/governance-policy-propagator@main

In response to this:

/test test-e2e-grc-framework

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