Fixes improper static list declarations + adds grep for it (#87207)

## About The Pull Request

I randomly came across a `var/list/static` in the code, which does not
actually do what was intended, and thought it was silly. A ctrl+f
revealed that this was a fairly common mistake, so I went and fixed all
the instances of it I could find.

~~Including one in lighting code, which it looked like they were trying
to create a global list to cache generated lighting sheet values for
speed, but it was just a normal list that got created each time
pointlessly. Now those values are actually being cached (using a global
var, because a `static` list was not the right thing to use there in the
first place).~~

Nevermind, it seems that this was in fact being cached even if it
shouldn't have been, because byond. Just rearranged it there seeing as
it works either way.


## Why It's Good For The Game

Code that does what it's supposed to

## Changelog

🆑
fix: fixes a bunch of improper static list declarations
/🆑

code/modules/mining/boulder_processing/boulder_types.dm

@@ -38,7 +38,7 @@
 	. = ..()
 
 	/// Static list of all minerals to populate gulag boulders with.
-	var/list/static/gulag_minerals = list(
+	var/static/list/gulag_minerals = list(
 		/datum/material/diamond = 1,
 		/datum/material/gold = 8,
 		/datum/material/iron = 95,
@@ -59,7 +59,7 @@
 	. = ..()
 
 	/// Static list of all minerals to populate gulag boulders with, but with bluespace added where safe.
-	var/list/static/expanded_gulag_minerals = list(
+	var/static/list/expanded_gulag_minerals = list(
 		/datum/material/bluespace = 1,
 		/datum/material/diamond = 1,
 		/datum/material/gold = 8,