Fixes some atom health bugs (#22312)

## About PR
- Fixes #22260
- Fixes #22304
- Fixes #22234

Additionally changes some health values for:

- Canisters, `50` -> `100`. Takes 5 crowbar hits to break instead of 3,
these shouldn't break so easily
- Railings, `30` -> `75`. 3 crowbars instead of 1
- Reinforced girders, `600` -> `300`. Still takes a lot of crowbars
before breaking, barebone girders shouldn't compete reinforced walls

code/game/objects/structures/railing.dm

@@ -8,14 +8,13 @@
 	layer = OBJ_LAYER
 	anchored = FALSE
 	pass_flags_self = LETPASSTHROW|PASSSTRUCTURE|PASSRAILING
+	hitsound = 'sound/effects/metalhit.ogg'
 
 	atom_flags = ATOM_FLAG_CHECKS_BORDER
 	obj_flags = OBJ_FLAG_ROTATABLE|OBJ_FLAG_MOVES_UNSUPPORTED
 
 	build_amt = 2
 
-	maxhealth = OBJECT_HEALTH_EXTREMELY_LOW
-
 	var/broken = FALSE
 	var/neighbor_status = 0
 
@@ -88,7 +87,7 @@
 
 		name = "[material.display_name] [initial(name)]"
 		desc = "A simple [material.display_name] railing designed to protect against careless trespass."
-		set_maxhealth(round(material.integrity / 5))
+		set_maxhealth(round(material.integrity / 2), TRUE)
 		set_health(maxhealth)
 		color = material.icon_colour
 
@@ -315,11 +314,6 @@
 			update_icon()
 		return
 
-	if(attacking_item.force && (attacking_item.damtype == DAMAGE_BURN || attacking_item.damtype == DAMAGE_BRUTE))
-		user.setClickCooldown(DEFAULT_ATTACK_COOLDOWN)
-		visible_message(SPAN_WARNING("\The [src] has been [LAZYLEN(attacking_item.attack_verb) ? pick(attacking_item.attack_verb) : "attacked"] with \the [attacking_item] by \the [user]!"))
-		add_damage(attacking_item.force, attacking_item.damage_flags(), attacking_item.damtype, attacking_item.armor_penetration, attacking_item)
-		return
 	. = ..()
 
 /obj/structure/railing/ex_act(severity)