R1:a5ad923573fd

Modernize Releeph "Product Activate" controller

Summary:
Ref T3549. A few things here:

- Releeph has an object called a "Project". We'd like to call this a "Product" instead. See T3549. Rename easy instances that don't break URIs.
- Releeph has a "ProjectController" which tries to be smart about loading objects. However, it's big and messy and doesn't have the finesse to do policies or `needX(...)` correctly. It also generates URIs which collide with one another. Introduce "ProductController" to…