[UI] Unpublished assets should not be accessible anonymously

[ckadner]

Describe the bug

After an admin unpublished an asset (unchecks the boxes for featured and published), the direct access link should no longer work for unauthenticated users (private browser, not logged in).

To Reproduce

1. Go to Datasets, select one, i.e. "Finance Proposition Bank"
2. In the browser URL, you will find the direct access link: https:///datasets/finance-proposition-bank
3. As a logged-in admin user, click on "VIEW ALL DATASETS"
4. Uncheck the boxes for "Featured" and "Published" for the "Finance Proposition Bank"
5. Go back to "FEATURED" and see the "Finance Proposition Bank" dataset should no longer be there
6. Open a Private Browser and paste the link from step 2.: https:///datasets/finance-proposition-bank
7. See the page show up with all the details

Expected behavior

• The anonymous user should get a 404 page
• Logged-in Admins should still see it

[Zachary-Fernandes]

@ckadner I would like to work on this issue.

[ckadner]

The check if an asset is published should be added here:

[ckadner]

Check for admin user:

mlx/dashboard/origin-mlx/src/App.tsx

Line 61 in 2d5ca37

const isAdmin = hasRole(getUserInfo(), 'admin');

[ckadner]

@Zachary-Fernandes -- Since we do not yet have a logout functionality #78 you would need to bring up the MLX UI in a private browser window to see the un-cached results for an anonymous user