Disable features in pro in prep for move.

This is part 1 of a two-part process to make export, snapshots and k-safety pro features.
This doesn't move any code, but disables these features trivially.
It then hacks up some tests to make everything pass.

Part 2 is to move code, including some of the tests to the pro repo. This will de-hack up some of hacked-up tests as well. They won't need to be explicitly disabled in community if they move to the pro repo.