From these listed services, the following are supported/unsupported
- Google Drawings
- Google Jamboard
- Google My Maps
- (New) Google Sites
- Google Data Studio
- Any third party shortcuts added using "Connect more apps"
Google Forms and the answers gsheets are supported, but the links will be broken as they will have new URLs in the destination. You can use Document Mappings to determine what the new links are to fix that post-migration (GAM should offer a solution in this regard).