Merge branch 'fix-sidebar' into 'master'

Adds position fixed to right sidebar

Closes #37144

See merge request !13494

app/assets/javascripts/new_sidebar.js

@@ -47,7 +47,6 @@ export default class NewNavSidebar {
 
     if (this.$sidebar.length) {
       this.$sidebar.toggleClass('sidebar-icons-only', collapsed);
-      this.$page.toggleClass('page-with-new-sidebar', !collapsed);
       this.$page.toggleClass('page-with-icon-sidebar', breakpoint === 'sm' ? true : collapsed);
     }
     NewNavSidebar.setCollapsedCookie(collapsed);