message: chore(callout): remove unused code
  ### Related Ticket(s)
  Refs
  ### Description
  Removes the following unused code in `DDSCalloutMixin`:
  * The `data-autoid`, given inheritances should have their own `data-autoid`
  * The styles, given all inheritances overrides the style
  ### Changelog
  **Removed**
  Some unused code in `DDSCalloutMixin`.
diff: */
  import { html } from 'lit-element';
  import settings from 'carbon-components/es/globals/js/settings';
  -import ddsSettings from '@carbon/ibmdotcom-utilities/es/utilities/settings/settings';
  import { Constructor } from '../../globals/defs';
  -import styles from './callout.scss';
  const { prefix } = settings;
  -const { stablePrefix: ddsPrefix } = ddsSettings;
  /**
  * Callout.
  @@ -22,12 +19,6 @@ const { stablePrefix: ddsPrefix } = ddsSettings;
  */
  const DDSCalloutMixin = <T extends Constructor<HTMLElement>>(base: T) => {
  return class extends base {
  - static styles = styles; // `styles` here is a `CSSResult` generated by custom WebPack loader
  -
  - static get stableSelector() {
  - return `${ddsPrefix}--callout`;
  - }
  -
  render() {
  return html`
  <div class="${prefix}--callout__column">
  