Namespace license checks Issue & MR template

What does this MR do?

Adds license checks around the Project Settings to apply a Issue & MR description template

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

How to handle for future cases where this has already been set?

Do not show the inputs on the Settings page and do not use the setting to fill in description when building Issue/MR.

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #2580 (closed)