chore(repo): prune dead code and duplicate abstractions (#3413)

fluxer_admin/openapi-admin.json

@@ -17272,7 +17272,6 @@
 					"ACCOUNT_TOO_NEW_FOR_GUILD",
 					"ACLS_MUST_BE_NON_EMPTY",
 					"ADMIN_API_KEY_NOT_FOUND",
-					"APPLICATION_NOT_OWNED",
 					"ALREADY_FRIENDS",
 					"BOTS_CANNOT_CREATE_GUILDS",
 					"BOTS_CANNOT_SEND_FRIEND_REQUESTS",
@@ -17568,7 +17567,6 @@
 					"Your account is too new to send messages in this community.",
 					"ACLs must be non-empty.",
 					"Admin API key wasn't found.",
-					"You don't own this application.",
 					"You're already friends with this user.",
 					"Bots can't create communities.",
 					"Bots can't send friend requests.",