Resolve "License Scanning metrics"

Fabien Catteaurequested to merge
465860-license-scanning-metrics into master

What does this MR do and why?

Use GitLab internal analytics to count project dependencies processed by License Scanning during a single scan.

  • dependencies being scanned (total)
  • dependencies with licenses extracted from the SBOM
  • dependencies with scan results
  • dependencies with no scan results (unknowns)

Group these counts per PURL type, and publish one event per PURL type.

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Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

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Related to #465860

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