Convert `transitions.module.css` to CSS modules (#41361)

frontend/src/metabase/components/LabelIcon/LabelIcon.module.css

@@ -6,6 +6,6 @@
 }
 
 .icon {
-  composes: transition-color from "style";
+  composes: transitionColor from "style";
   color: currentColor;
 }

frontend/src/metabase/css/core/transitions.module.css

-:global(.transition-color),
-.transition-color,
 .transitionColor {
   transition: color 0.3s linear;
 }