remove old group heading

public/app/core/components/Picker/GroupHeading.tsx

@@ -1,12 +0,0 @@
-import React from 'react';
-import { components } from 'react-select';
-
-export const GroupHeading = props => {
-  return (
-    <label className="description-picker-option__button btn picker-option-group">
-      <components.GroupHeading {...props} />
-    </label>
-  );
-};
-
-export default GroupHeading;

public/sass/_grafana.scss

@@ -105,7 +105,6 @@
 @import 'components/page_loader';
 @import 'components/thresholds';
 @import 'components/toggle_button_group';
-@import 'components/group-heading';
 @import 'components/value-mappings';
 @import 'components/popover-box';
 

public/sass/components/_group-heading.scss

@@ -1,6 +0,0 @@
-.picker-option-group {
-  cursor: default;
-  color: $text-color-weak;
-  font-size: $font-size-sm;
-  font-weight: $lead-font-weight;
-}