(fix) bind metrics server to localhost interface only

[anik120]

Bind metrics server endpoints to 127.0.0.1 instead of all interfaces to improve security by preventing direct external access to metrics endpoints. This change supports downstream kube-rbac-proxy integration (see openshift/operator-framework-olm#1061 for more info) by ensuring metrics are only accessible locally within the pod.

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Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Bug fixes are accompanied by regression test(s)
• e2e tests and flake fixes are accompanied evidence of flake testing, e.g. executing the test 100(0) times
• tech debt/todo is accompanied by issue link(s) in comments in the surrounding code
• Tests are comprehensible, e.g. Ginkgo DSL is being used appropriately
• Docs updated or added to /doc
• Commit messages sensible and descriptive
• Tests marked as [FLAKE] are truly flaky and have an issue
• Code is properly formatted

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