Add action to open menu

We add menu items dynamically, so we want to test if the menu contains an item or not without clicking on it

The library already has the `openOverflow` function on the [`BaristaMenuClickInteractions`](https://github.com/AdevintaSpain/Barista/blob/master/library/src/main/java/com/schibsted/spain/barista/interaction/BaristaMenuClickInteractions.kt) but it's private 🤷‍♂