Deletes the caller's account (requires google token). See Coflnet.Sky.Api.Services.AccountDeletionService for exactly what this does and does not cover - it cascades what SkyApi and SkyIndexer can reach (account record, connected minecraft accounts, player state, settings incl. privacy settings), but purchase history is kept where legally required and some other Coflnet services are not wired into the cascade yet. Because of that this is never a guarantee of full erasure across every downstream service - the response lists what was erased and what is retained.