Switch to UBI8-minimal

What does this MR do?

The UBI-8 minimal image is smaller and has fewer packages compared to the full ubi-8 image. This change resolves numerous vulnerabilities due to removing unnecessary packages.

Image	Before ubi8-minimal	After ubi8-minimal
secrets	145.22 MiB	93.71 MiB

What are the relevant issue numbers?

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