CI: Add testing jobs

What does this MR do?

CI: Add testing jobs

Add jobs to:

1. Run unittests with ginkgo. This skips e2e tests.
2. Check if make generate is up to date.
3. Check if make manifests is up to date.

Author's Checklist

For anything in this list which will not be completed, please provide a reason in the MR discussion.

Required

• Ensure a release milestone is set.
• MR title and description are up to date, accurate, and descriptive.
• MR targeting the appropriate branch.
• MR has a green pipeline on GitLab.com.
• When ready for review, MR is labeled workflowready for review per the MR workflow.

Expected

• Test plan indicating conditions for success has been posted and passes.
• Documentation is created or updated.
• Tests are added.

Related issues