Removing extraneous global_styling/mixins/forms file

and importing the correct files in the filter_group and combo_box files

src/components/combo_box/_index.scss

@@ -1,3 +1,6 @@
+@import '../form/variables';
+@import '../form/mixins';
+
 @import 'combo_box';
 @import 'combo_box_input/index';
 @import 'combo_box_options_list/index';

src/components/filter_group/_index.scss

@@ -1,3 +1,6 @@
+@import '../form/variables';
+@import '../form/mixins';
+
 @import 'filter_group';
 @import 'filter_button';
 @import 'filter_select_item';

src/global_styling/mixins/_index.scss

@@ -1,5 +1,4 @@
 @import 'naming';
-@import 'forms';
 @import 'responsive';
 @import 'shadow';
 @import 'size';