Prefer OTEL to exporter if both enabled

[benjaminjb]

Checklist:

• Have you added an explanation of what your changes do and why you'd like them to be included?
• Have you updated or added documentation for the change, as applicable?
• Have you tested your changes on all related environments with successful results, as applicable?
  • Have you added automated tests?

Type of Changes:

• New feature
• Bug fix
• Documentation
• Testing enhancement
• Other

What is the current behavior (link to any open issues here)?

We had logic to prefer OTel if both were enabled, but that was dropped so we could discuss it; this reenables that behavior with the collector util func logic.

What is the new behavior (if this is a feature change)?

• Breaking change (fix or feature that would cause existing functionality to change)

If both Exporter and OTel Metrics are enabled, CPK prefers OTel.

Other Information: