Introduce primary-ids in Rule Metadata and update convert

What does this MR do?

This MR does a two things:

1. updates the /rules to include primary-id and secondary-ids metadata.
2. updates convert to use the hardcoded identifiers from the rule metadata instead of generating them on the fly.

The purpose of this MR is to prove out an operation that will remove /rules this repo and instead pull from a single source of truth, currently sast-rules, for semgrep rules.

What are the relevant issue numbers?

gitlab-org/gitlab#321184 (closed)

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
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer