CMS BS5 migration - Adding the left spacing to the labels next to checkbox (#20780)

* adding left-margin for the checkbox-label

* moving the styling to appropriate file and making it more generic

GitOrigin-RevId: 66484344891c77f6d31147ef7d0e0d55987a8445

services/web/frontend/stylesheets/bootstrap-5/components/form.scss

@@ -179,4 +179,8 @@
 
     @include body-sm;
   }
+
+  .checkbox-label {
+    margin-left: var(--spacing-04);
+  }
 }