Upgrades GODMODE from a flag to a trait. (#86596)

## About The Pull Request
GODMODE has a lot of sources that toggle it. From admin-stuff to status
effects, components, actions and mobs which are supposed to be
invincible. It's better off as a trait than a flag, so we can manage
these sources.

## Why It's Good For The Game
See above.

## Changelog

🆑
admin: godmode is now a datum trait instead of a bitflag. This means the
process for toggling it is a little different now.
/🆑

code/datums/ai/basic_mobs/targeting_strategies/basic_targeting_strategy.dm

@@ -25,8 +25,7 @@
 	if(ismob(the_target)) //Target is in godmode, ignore it.
 		if(living_mob.loc == the_target)
 			return FALSE // We've either been eaten or are shapeshifted, let's assume the latter because we're still alive
-		var/mob/M = the_target
-		if(M.status_flags & GODMODE)
+		if(HAS_TRAIT(the_target, TRAIT_GODMODE))
 			return FALSE
 
 	if (vision_range && get_dist(living_mob, the_target) > vision_range)