Verifiable Rule Integrity and Active Rule Reporting

What does this MR do?

Report active rules in the semgrep analyser and report rule checksums so that rule integrity is verifiable.

What are the relevant issue numbers?

Add a test or review step that explicitly check... (gitlab-org/gitlab#463607 - closed) • Julian Thome • 17.3 • On track

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 updated/added for this feature/bug
• Job definition updated, if necessary
  • Auto-DevOps template
  • Job definition example
  • CI Templates
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer