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/modules/wiremod/components/string/textcase.dm

@@ -41,7 +41,7 @@
 	var/result
 	switch(textcase_options.value)
 		if(COMP_TEXT_LOWER)
-			result = lowertext(value)
+			result = LOWER_TEXT(value)
 		if(COMP_TEXT_UPPER)
 			result = uppertext(value)