Remove /datum/game_mode, we SSdynamic now [again] (#79965)

I don't remember what was hard about this last time it took me like 20
minutes this time so I'm scared.

Removes dynamic simulations, only I have used them and it's a lot more
complicated now with this. I plan on making Dynamic simulations a part
of moth.fans anyway

code/modules/admin/admin_verbs.dm

@@ -169,7 +169,6 @@ GLOBAL_PROTECT(admin_verbs_debug)
 	return list(
 	#ifdef TESTING /* Keep these at the top to not make the list look fugly */
 	/client/proc/check_missing_sprites,
-	/client/proc/run_dynamic_simulations,
 	#endif
 	/proc/machine_upgrade,
 	/datum/admins/proc/create_or_modify_area,