Secret Detection: Add Yandex.Cloud secret formats. Issue gitlab-org/gitlab#353039

What does this MR do?

I'd love to add Secret Detection token patterns for Yandex.Cloud in Gitlab Secret-Detection.

What are the relevant issue numbers?

Relevant issue numbers: gitlab-org/gitlab#353039 (closed)

Does this MR meet the acceptance criteria?

I think yes, but let me know if i skip something important please.

• 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