Wraps lowertext() to ensure proper stringification. (#82442)

## About The Pull Request

Fixes #82440

This PR just creates a new macro, `LOWER_TEXT()` (yes the irony is not
lost on me) to wrap around all calls of `lowertext()` and ensure that
whatever we input into that proc will be stringified using the `"[]"`
(or `tostring()` for the nerds) operator. very simple.

I also added a linter to enforce this (and prevent all forms of
regression) because I think that machines should do the menial work and
we shouldn't expect maintainers to remember this, let me know if you
disagree. if there is a time when it should be opted out for some
reason, the linter does respect it if you wrap your input with the
`UNLINT()` function.

code/datums/components/material/material_container.dm

@@ -102,7 +102,7 @@
 		var/datum/material/M = I
 		var/amt = materials[I] / SHEET_MATERIAL_AMOUNT
 		if(amt)
-			examine_texts += span_notice("It has [amt] sheets of [lowertext(M.name)] stored.")
+			examine_texts += span_notice("It has [amt] sheets of [LOWER_TEXT(M.name)] stored.")
 
 /datum/component/material_container/vv_edit_var(var_name, var_value)
 	var/old_flags = mat_container_flags