Add new properties to aid in removing the 1-variant fallback

These new properties are essentially methods to specify "outgoing
transitions" in blueprint files. There are lots of host tests
that want to include apps built for device in their data, so they
need a property that adds dependencies based on the device variants
instead of copying the same host variants.

After this cl is submitted, I'll do an LSC to update all the usages
that are relying on the 1-variant fallback to use these properties
instead.

Bug: 372091092
Test: m nothing --no-skip-soong-tests
Change-Id: I45b8fb024da120ad61606e3a21de86e4392be2a4