Resolve "Developers should be able to create new projects in group"

• Add an option to allow Developer roles to create projects within a group (Project creator would be the owner)

• Create an option at the server level so all groups get this functionality

• Developers + Masters is selected by default in the admin section.

• Groups can override the admin default setting.

• Ensure this feature is licensed for EEP/Silver and can be licensed at the group level

• Add option with i18n support so we don't need to go back and redo it at a later point

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

What are the relevant issue numbers?

Closes #2534 (closed)