[CI] Remove review environment-related jobs from dev

Context

The following discussion from !654 (merged) should be addressed:

• @clemensbeck started a discussion:

  Question (non-blocking, possible follow-up): Could we also skip the _gke and _gke122 jobs on dev?

Summary

After some discussion in Slack, it was discussed that review jobs may not be needed in dev at all. We don't release the Operator from Dev, so we're only duplicating testing that is already completed in .com pipelines.

Removing these jobs means we can remove the clusters, which would be a significant cost savings. This would also reduce opportunities for pipeline failures.

Acceptance criteria

• Review jobs are excluded in dev CI pipelines
• Dev CI clusters are deleted