OCM-19740 - local observability

[Alcamech]

What type of PR is this?

Documentation

What this PR does / why we need it?

Adds an "Adding New Metrics" guide to docs/metrics.md with step-by-step instructions for defining, registering, and verifying Prometheus metrics locally.
Adds an Metrics Tracding guide to docs/metrics-tracing.md that provides a comprehensive mapping of all Prometheus metrics

Which Jira/Github issue(s) this PR fixes?

OCM-19740

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Alcamech
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[openshift-ci]

@Alcamech: all tests passed!

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