Refactor Enchantment flip cards to not use private token classes

[muz]

Linked to #14315

Follow up to #14569

Again, there's one implementation that would throw Flexible Constructor Bodies warnings, so it's beyond a quick refactor like the rest; RuneTailEssence from mage.cards.r.RuneTailEssence which can be tackled in a follow up PR

[theelk801]

we really should rework how flip cards work, being flipped is like being tapped or transformed and the flipped characteristics should be built into the card rather than be applied by the effect that flips them

[muz]

I don't disagree at all. I started this off from the rabbit hole of finding some refactoring that needed being done in the engine around tokens, then finding the unit tests that would have helped validate my changes were disabled, and amongst the various things it does, was calling out private token classes being created unnecessarily.

That said, I think that refactoring the flip effect to be like you describe is definitely an iterative improvement, but I don't necessarily think it should block also getting token tests unignored if that makes sense. Realistically, doing that refactor is very much something that'll happen when it happens - and the motivation for that is relatively low with Everything Else and the fact WotC aren't really releasing much in the way of Flip mechanics currently