Introduce <NavigateToFirstResource>

[djhi]

Problem

In the absence of a dashboard component, the / route redirects to the list view of the first Resource (or the first available list view of all resources).

With the introduction of canAccess, this may lead to an Access Denied page. For instance, if the first resource is a posts list, and the connected user doesn't have the { action: "list", resource: "posts" } permission, they will see the access denied page.

Solution

1. Use access control to narrow down the possible home pages
2. Since access control depends on authentication, require authentication for the default / route

This 2. is a slight BC break. In the case of a default list view with disableAuthentiction turned on, anonymous users won't be able to access it. It's an easy fix though: set the <Admin dashboard> to a <Navigate> component to bypass the default route selection.

Additional Checks

• The PR targets master for a bugfix, or next for a feature
• The PR includes unit tests (if not possible, describe why)
• The PR includes one or several stories (if not possible, describe why)
• The documentation is up to date

[fzaninotto]

Excellent!