Update UATs notebooks for never kubeflow-training SDK

[misohu]

Context

Training operator UATs are using older version of training-operator sdk 1.6.0 ... in order to update to higher version some changes needs to be done in notebook cells.

For 1.8 kubeflow we need training-operator sdk 1.7.0.
For 1.9 kubeflow we need training-operator sdk 1.8.0 (which is currently in release).

What needs to get done

Update kubeflow-training package in tests/notebooks/training/requirements.in to 1.7.0.
Update cells in tests/notebooks/training to work with the updated package.

NOTE: for the 1.9 release we can update the package after they release it.

Definition of Done

kubeflow-training is updated and working in UATs

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5992.

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