Removes bad nodamage var from projectiles, fixes Juggernaut / Rust Walker projectiles doing zero damage (#73806)

## About The Pull Request

- Juggernaut and Rust Walker projectiles were subtyped off of magic,
which is `nodamage`.

- The juggernaut actually had a copy+paste error with their type
`on_hit` which caused none of their special effects on hit ("relative
patching catches this")

- Then I realized projectiles have this var `nodamage` which is, for all
intents and purposes, just `damage > 0`. it's not checked for pacifism,
it's just that. This is dumb. So very dumb, so I removed it.
- There are, however, a few situations which used it in a unique way,
such as the blast wave cannon. This is why I replaced it with a proc,
`is_hostile_projectile`, for certain situations to actually find out if
the projectile is damaging. Projectiles can override this on a per type
basis by default, damaging projectiles = hostile.
- This has a chance to break some things, but I ... kinda doubt it will.

Fixes #73756

## Why It's Good For The Game

Projectiles that act as they should, less dumb vars

## Changelog

🆑 Melbert
fix: Fixes Juggernaut / Rust Walker projectiles doing zero damage
fix: Fixes Juggernaut projectiles not doing bonus damage to nearby
structures
code: Removed projectile nodamage var, replaces it with just checking
for damage
/🆑

code/modules/mod/modules/modules_engineering.dm

@@ -115,7 +115,6 @@
 	icon_state = "tether_projectile"
 	icon = 'icons/obj/clothing/modsuit/mod_modules.dmi'
 	damage = 0
-	nodamage = TRUE
 	range = 10
 	hitsound = 'sound/weapons/batonextend.ogg'
 	hitsound_wall = 'sound/weapons/batonextend.ogg'

code/modules/mod/modules/modules_medical.dm

@@ -164,7 +164,6 @@
 /obj/projectile/organ
 	name = "organ"
 	damage = 0
-	nodamage = TRUE
 	hitsound = 'sound/effects/attackblob.ogg'
 	hitsound_wall = 'sound/effects/attackblob.ogg'
 	/// A reference to the organ we "are".

code/modules/mod/modules/modules_ninja.dm

@@ -57,7 +57,7 @@
 /obj/item/mod/module/stealth/proc/on_bullet_act(datum/source, obj/projectile/projectile)
 	SIGNAL_HANDLER
 
-	if(projectile.nodamage)
+	if(!projectile.is_hostile_projectile())
 		return
 	unstealth(source)
 

code/modules/mod/modules/modules_supply.dm

@@ -560,7 +560,6 @@
 	icon_state = "mine_bomb"
 	icon = 'icons/obj/clothing/modsuit/mod_modules.dmi'
 	damage = 0
-	nodamage = TRUE
 	range = 6
 	suppressed = SUPPRESSED_VERY
 	armor_flag = BOMB

code/modules/mod/modules/modules_timeline.dm

@@ -294,7 +294,6 @@
 	name = "eradication beam"
 	icon_state = "chronobolt"
 	range = CHRONO_BEAM_RANGE
-	nodamage = TRUE
 	///Reference to the tem... given by the tem! weakref because back in the day we didn't know about harddels- or maybe we didn't care.
 	var/datum/weakref/tem_weakref