License information should be available under "/admin" or "/admin/license" page

Description

The /admin page has a lot of useful information but fails to display the type of license currently in use.

At the moment one can determine whether they are using CE or EE, however there is no indication to whether that's an EE starter or EE premium license.

This results in support tickets being opened to request this information.

Proposal

Include this information on the "/admin" or "/admin/license" page.

Links / references

ZD: https://gitlab.zendesk.com/agent/tickets/74573

Documentation blurb

  1. Why should someone use it; what's the underlying problem.

This information should be available to administrators of GitLab

  1. What is the solution.

Include this information on the "/admin" or "/admin/license" page.

  1. How does someone use this

User visits page and can determine their current applied license.