Add security triage automation

What does this MR do?

Add pipeline step to run security triage automation script to create issues and resolve vulns in secrets.

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab/-/issues/420829

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