Implement FOSSA Plugin for License Scans in Intersect

[leordev]

From https://github.com/squareup/ospo/issues/21 & https://github.com/squareup/ospo/issues/27

After talks with Alex, we decided that it's a natural path to just implement fossa license scans inside intersect. It's a low hanging fruit since we have Intersect running for Inner and OpenSource projects across the company.

By doing this we will be able to remove all items regarding License, security and SAST scanning.

At the moment only the license is missing from intersect, once its implemented when doing the review our only job is to check if fossa is raising any license issues that should be handled by the project leads.