Introduce CI integration event for DS

What does this MR do?

We introduce an internal env var which contains information like the following:

• template::latest
• template::v2
• component:v1.1.0

Then we track these values with the use of an event

{
	"event": "collect_ds_analyzer_scan_ci_integration_metrics_from_pipeline",
	
	// Columns (join, filter, fast)
	
	"property": "scan_uuid",          // join: Allows joining
	"label": "<INTERNAL_DS_ANALYZER_CI_INTEGRATION>"           // fast: Config environment variable value
}

What are the relevant issue numbers?

Collect information on how the new DS analyzer ... (gitlab-org/gitlab#578952)

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
  • Auto-DevOps template
  • Job definition example
  • CI Templates
• Ensure the report version matches the equivalent schema version
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer