Style: Trim trailing whitespace and ensure newline at EOF

Found by apply the file_format checks again via #91597.

modules/gdscript/tests/scripts/analyzer/features/cast_enum_to_int.gd

@@ -6,4 +6,3 @@ func test():
 	var a := Foo.A
 	var b := a as int + 1
 	print(b)
-	

modules/gdscript/tests/scripts/analyzer/features/preload_constant_types_are_inferred.gd

@@ -3,4 +3,3 @@ const Constants = preload("gdscript_to_preload.notest.gd")
 func test():
 	var a := Constants.A
 	print(a)
-