message: add storybook example of stack overflow search result with icon
diff: import { StackOverflowSearchResultListItem } from '../../plugin';
  import { wrapInTestApp } from '@backstage/test-utils';
  import React, { ComponentType } from 'react';
  +import { StackOverflowIcon } from '../../icons';
  export default {
  title: 'Plugins/Search/StackOverflowResultListItem',
  @@ -37,3 +38,18 @@ export const Default = () => {
  />
  );
  };
  +
  +export const WithIcon = () => {
  + return (
  + <StackOverflowSearchResultListItem
  + result={{
  + title: 'Customizing Spotify backstage UI',
  + text: 'Name of Author',
  + location: 'stackoverflow.question/1',
  + answers: 0,
  + tags: ['backstage'],
  + }}
  + icon={<StackOverflowIcon />}
  + />
  + );
  +};
  