[PromoBannerv2] Allow to pass icon and iconPosition properties to component's buttons

[quarties]

Description

Currently, only 3 following Button component properties are available to pass in the PromoBannerV2 component:

  /**
   * Shows the primary CTA button
   */
  primaryButton?: {
    handleClick: () => void;
    label: string;
    kind?: ButtonKind;
  };

We additionally need to pass the icon and iconPosition properties. Also, it would be nice to have all possible properties supported here out of the box.

Design

[vladko-uxds]

Duplicates by
#873