Fix 404 error on push rules admin settings if license is not installed

What does this MR do?

Fix 404 in admin area if license is missing and user navigates to push rules

Are there points in the code the reviewer needs to double check?

Not sure if empty_states ist the right location for the new screen. On the one hand it is an empty state due that we need to hide the groups, on the other hand the empty_state folder had another intention.

Why was this MR needed?

It is pretty bad if you try to promote a product which has such an easy discoverable 404 ;)

Screenshots (if relevant)

before:

after:

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
• EE specific content should be in the top level /ee folder
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

This fixes #3825 (closed)