Switch to stylelint. (#23572)

scss/_input-group.scss

@@ -1,3 +1,5 @@
+// stylelint-disable selector-no-qualifying-type
+
 //
 // Base styles
 //
@@ -88,13 +90,11 @@
     @include border-radius($input-border-radius-lg);
   }
 
-  // scss-lint:disable QualifyingElement
   // Nuke default margins from checkboxes and radios to vertically center within.
   input[type="radio"],
   input[type="checkbox"] {
     margin-top: 0;
   }
-  // scss-lint:enable QualifyingElement
 }