[EuiContextMenu] [A11y] EuiContextMenu does not place the focus correctly after submitting the action

1. Go to https://elastic.github.io/eui/#/navigation/context-menu
2. Open context menu via keyboard and go through its elements
3. Confirm an action with 'enter'
Actual behaviour: focus is lost

Expected behaviour: focus is back to the menu trigger. 

https://user-images.githubusercontent.com/4283304/166821877-540b813b-c3ed-4446-858e-fc843f7e8652.mov


