Promote test to reliable

What does this MR do and why?

Describe in detail what your merge request does and why.

Promotes Kubernetes Agent end to end test to the reliable test suite. Runs only in staging pipelines.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.