fix(react): update issue with combobox buttons overlapping (#9742)

* feat(ContentSwitcher): preliminary unstable refactor

* fix(combobox): overlapping bug

* Delete UnstableContentSwitcher-story.js

* Delete UnstableContentSwitcher.js

* Delete styles.scss

* Delete index.js

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

packages/components/src/components/list-box/_list-box.scss

@@ -408,7 +408,7 @@ $list-box-menu-width: rem(300px);
     position: absolute;
     top: 50%;
     /* to preserve .5rem space between icons according to spec top/transform used to center the combobox clear selection icon in IE11 */
-    right: rem(36px);
+    right: rem(40px);
     display: flex;
     width: rem(24px);
     height: rem(24px);