Core/Misc: Add permission that allows player to be AFK on the battleground.

sql/updates/auth/master/2024_01_06_01_auth.sql

@@ -0,0 +1,7 @@
+--
+DELETE FROM `rbac_permissions` WHERE `id` = 53;
+INSERT INTO `rbac_permissions` (`id`, `name`) VALUES (53, "Can be AFK on the battleground");
+
+DELETE FROM `rbac_linked_permissions` WHERE `linkedId` = 53;
+INSERT INTO `rbac_linked_permissions` (`id`, `linkedId`) VALUES
+(193, 53);