Move group create project permissions to Starter

Move the ability configure which roles are allowed to create projects in groups to GitLab Starter from GitLab Premium.

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

• License check

Why was this MR needed?

The ability for developers to create projects in groups is for most teams the preferred default, and should be available in Starter.

Screenshots (if relevant)

n/a

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• If paid feature, have we considered GitLab.com plan and how it works for groups and is there a design for promoting it to users who aren't on the correct plan
• End-to-end tests pass (package-qa manual pipeline job)

What are the relevant issue numbers?

Closes #5457 (closed)