_onLeaveButton(ev) {
    const valueNode = /** @type {HTMLElement} */ (
      this.shadowRoot?.querySelector('.input-stepper__value')
    );
    valueNode.removeAttribute('aria-live');
    this.dispatchEvent(new Event(this._leaveEvent));
  }
Redispatch leave event on host when catching leave event
on the incrementor and decrementor button.

This redispatched leave event will be caught by
InteractionStateMixin to set "touched" state to true.

Interacting with the buttons is "user interactions"
the same way as focusing + blurring the field (native input)

@protected
@param {Event} ev