Reorganize container registry e2e tests
What does this MR do and why?
This MR intends to:
- Update the docker versions under test
- Clean up the garbage collection test that is not being used anymore
- Make the distinction clear between SaaS and Self-managed Container Registry tests at the end-to-end level (issue)
- Simplify dependency proxy to use only the latest docker version as it is less relevant to test different docker versions on this feature
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.