Feature/11167: Proper labelling of boss-enemies

[BramTeurlings]

Split off from: Archipelago PR

Split between "bosses" and "minibosses"

• The main bosses: Lorthos, Emrakul, Lathliss, Ghalta, Griselbrand & Akroma are currently indistinguishable from mini-bosses in the game files. This is something that I would like to have for the Archipelago implentation so I suggest moving the aforementioned 6 inside of the decks\boss folder and all of the other bosses inside of the decks\miniboss folder.
• Various bosses were wrongly labeled as not being a boss, Jace comes to mind. Each enemy that has a unique boss effect on the battlefield is now labeled properly as "boss" in Shandalar's enemies.json, their deck is also moved to the appropriate folder as mentioned in the previous point.
• Some enemies had the "boss" label in Shandalar's enemies.json while not being a boss at all, the boss label has been removed from these enemies.
• Originally, the split between these two folders already existed but it seems that someone moved all bosses into one decks\boss folder in the last 6 months. This can still be seen in forge-gui/res/adventure/Shandalar Old Border/world/enemies.json as many of them still reference decks\miniboss instead of boss. This PR will make the regular Shandalar game consistent with Old Border again.