[exporterhelper] Add observability to the new exporter helper #8244
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This change adds collector's internal metrics and tracing to the new request-based exporter helpers. Only those metrics and traces are added that are already adopted by the existing exporter helpers for backward compatibility. The new exporter helpers can and should expose more metrics in the future, e.g. for tracking converter errors.
This PR is built on top of #8178
Only the second commit contains exclusive changes
Tracking Issue: #8122