bugfix(exporter): set user agent for otlp metrics exporter #4475
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Description
Update OTLP over HTTP exporter for metrics to ensure the user agent is set consistently with the logs and traces exporter.
Fixes #4474
Type of change
Please delete options that are not relevant.
How Has This Been Tested?
Manually tested to ensure the new header is set
Does This PR Require a Contrib Repo Change?
Checklist: