Add Facebook BSD+PATENTS license to the "unacceptable" list

What does this MR do?

Adds Facebook's 3-clause BSD + PATENTS license to the list of unacceptable licenses

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

This outlaws, among other projects:

• The reference GraphQL client library
• React.JS

Why was this MR needed?

Legal decision made in gitlab-com/organization#117

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Review
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

gitlab-com/organization#117