feat: add Otel collector data flow quickstart dashboard

[bpschmitt]

Summary

This quickstart contains a dashboard that provides insight into the OpenTelemetry Collector performance and data flow.

Pre merge checklist

• Did you check you NRQL syntax? - Does it work?
• Did you include a Data source and Documentation reference?
• Are all documentation links publicly accessible?
• Did you check your descriptive content for voice and tone?
• Did you check your descriptive content for spelling and grammar errors?
• Did you review your content with a subject matter expert? (e.g. a Browser agent quickstart is reviewed with a member of the Browser Agent team)

Dashboards

• Does the PR contain a screenshot for each of your dashboards?
• Do your screenshots show data?
• Has the sanitization script been run on each dashboard?

[CLAassistant]

All committers have signed the CLA.

[pkudikyala]

Hi @bpschmitt,

Could you please add the datasource and alerts for this quickstart? The document you provided only lists metrics without presenting the integration steps. Please update it with a proper integration guide. Below are the guidelines for creating datasources and alerts.

1. https://github.com/newrelic/newrelic-quickstarts/blob/release/CONTRIBUTING.md#data-sources
2. https://github.com/newrelic/newrelic-quickstarts/blob/release/CONTRIBUTING.md#alerts

[bpschmitt]

@pkudikyala done. please review.

[pkudikyala]

@pkudikyala done. please review.

@bpschmitt , The OpenTelemetry datasource is already available in the catalog-elixir repository and production, so you can just remove the opentelemetry folder from datasource and files in it