feat: move general imports to specific scss files (#32121)

This moves XModule scss imports to the specific files where they are required instead of
having a common XModule scss import list.

This is part of  https://github.com/openedx/edx-platform/issues/31624

xmodule/css/capa/display.scss

@@ -18,6 +18,7 @@
 // * +Problem - Choice Text Group
 // * +Problem - Image Input Overrides
 // * +Problem - Annotation Problem Overrides
+@import 'bourbon/bourbon';
 
 // +Variables - Capa
 // ====================