use direct metric export instead of prometheus scraping

[matthagenbuch]

What is the current behavior?

currently uses prometheus metric self-scraping to export monitoring metrics

What is the new behavior?

export monitoring metrics directly to lightstep

this will resolve metric type mismatch issues resulting from multiple ways of exporting otelcol metrics to internal lightstep projects

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Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests(make test) for the changes have been added (for bug fixes / features) and pass
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Lint (make lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Does this introduce a breaking change?

• Yes
• No

Other information