[test-operator] Remove ntp_extra_image

[lpiwowar]

The cifmw_test_operator_ntp_extra_images was created with the neutron team in mind. The cifmw_test_operator_extra_images is more generic version of the previous var and it is now the recommended way how to configure jobs with extra images.

As a pull request owner and reviewers, I checked that:

• Appropriate testing is done and actually running
• Appropriate documentation exists and/or is up-to-date:
  • README in the role
  • Content of the docs/source is reflecting the changes

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[softwarefactory-project-zuul]

Merge Failed.

This change or one of its cross-repo dependencies was unable to be automatically merged with the current state of its repository. Please rebase the change and upload a new patchset.
Warning:
Error merging github.com/openstack-k8s-operators/ci-framework for 1789,628c51c82be91a6eb0ce74665155054c8e806ad4

[openshift-merge-robot]

PR needs rebase.

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[github-actions]

Thanks for the PR! ❤️
I'm marking it as a draft, once your happy with it merging and the PR is passing CI, click the "Ready for review" button below.