(case 2) Add the runtime-images COPY cmd back on DS notebook

[atheo89]

Fix this comment: #909 (comment)

Description

This line removed while I was working on the https://issues.redhat.com/browse/RHOAIENG-20241.
So in case that we are not ready to incorporate the generation of pipeline-runtime-images config map via the odh-notebook-controller, we should keep still funtional the old logic of the runtimes, if not we are fine without this PR as a follow up is been created to clean up the notebooks from the old structure: #943.

❗ SUPER IMPORTANT NOTE: ❗
Case 1: If the corresponding PR: opendatahub-io/kubeflow#513 on notebook-controller is been merged, this PR should be merged as well #943
Case 2: If the PR on notebook-controller is not merged, should revert the COPY cmd on DS dockerfile deleted by mistake by this PR.

How Has This Been Tested?

GHA builds

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

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@atheo89: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/notebooks-ubi9-e2e-tests	6329621	link	true	/test notebooks-ubi9-e2e-tests

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