Add bubbles to ActionMenu component

[acbreton]

While working with ActionMenu, I noticed that it was not working with an itemActivated event I was trying to configure. I noticed that the SelectPanel had this same type of event but it contained bubbles: true.

Filing this issue to see if we can add bubbles to the ActionMenu component as well.

Relevant Links

• view_components/app/components/primer/alpha/action_menu/action_menu_element.ts

  Lines 360 to 362 in 1d5532b

  	new CustomEvent('itemActivated', {
  	detail: {item: item.parentElement, checked: this.isItemChecked(item.parentElement)},
  	}),

• view_components/app/components/primer/alpha/select_panel_element.ts

  Line 913 in 1d5532b

  bubbles: true,

• Related Slack thread.