Disable jupyterlab-jhub-apps extension when jhub-apps is disabled

[krassowski]

Reference Issues or PRs

• Sibling to Add jupyterlab-jhub-apps extension to base image nebari-docker-images#185
• Addresses [ENH] - Enable ability to launch an app directly from notebook jhub-apps#472
• https://github.com/nebari-dev/jupyterlab-jhub-apps

Reference for the labconfig/page_config.json file:

• https://jupyterlab.readthedocs.io/en/stable/user/extensions.html#enable-disable-config
• https://jupyterlab.readthedocs.io/en/stable/user/directories.html#labconfig-directories

What does this implement/fix?

Put a x in the boxes that apply

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe):

Testing

• Did you test the pull request locally?
  Yes
• Did you add new tests?

How to test this PR?

1. Deploy with:

default_images:
  jupyterhub: quay.io/nebari/nebari-jupyterhub:jhub-apps-2024-10-1-and-jlab-ext
  jupyterlab: quay.io/nebari/nebari-jupyterlab:jhub-apps-2024-10-1-and-jlab-ext
jhub_apps:
  enabled: true

2. Open JupyterLab
3. Open a Notebook
4. See that there is a toolbar item ":rocket: Deploy App" like this:
   
5. Switch jhub_apps.enabled to false and deploy again
6. Open JupyterLab/Notebook see that the toolbar item is no longer here

Any other comments?

None

[krassowski]

I believe the failing integration test is unrelated and tracked in #2777.