Fixes jupyter installation randomly failing

What does this MR do?

The JupyterHub application fails to install through the Kubernetes integration with the following error:

Something went wrong while installing JupyterHub
Operation failed. Check pod logs for install-jupyter for more details.

When checking the logs we see the following error:

Error: timed out waiting for the condition

It seems spawning is not working well when the Helm chart awaits upgrading the jupyterhub pod before images that are used by the hub pod. Disabling hook-prePuller makes it work

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/58927

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [-] Documentation created/updated via this MR
• [-] Documentation reviewed by technical writer or follow-up review issue created
• [-] Tests added for this feature/bug
• [-] Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• [-] Conforms to the database guides
• [-] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• [-] Security reports checked/validated by reviewer

Closes #58927 (closed)