Description of problem:

**

When a user does not have access to a specific plugin like bulk import, OCM etc, RHDH displays a 404 error page. This behavior is not ideal, as it can be confusing for the user. Instead, it should either:

1. Hide the plugin from navbar/sidebar
2. Display a clear error message indicating that the user does not have the necessary permissions to access the plugin.

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

1. Deploy latest version of rhdh
2. Configure and enable rbac.
3. Enable plugins like bulk import.
4. Login to rhdh with user that doesn't have permission to that plugin
5. Check Sidebar it will show the bulk import plugin
6. Click on it and a page with ERROR 404: PAGE NOT FOUND will be shown  

Actual results: ERROR 404: PAGE NOT FOUND

Expected results: 

Reproducibility (Always/Intermittent/Only Once): Always

Build Details: 1.3/latest

Additional info (Such as Logs, Screenshots, etc):