Speed up resolution of some flavors

For example the demo flavor is mostly Standard flavor with a few added stuff but since the flavor picker fully validate non standard flavors before displaying them it takes a long time (since demo flavor as a huge dependency tree).

Hard to make it super fast and at the same time display only compatible flavor but there might be some way to speed up a bit but skeeping validation of some standard dependencies (which will be validated anyway when you try to install it).