[UIShell]: HeaderMenu does not close if you click a HeaderGlobalAction

[keithkade]

What package(s) are you using?

• carbon-components
• carbon-components-react

Detailed description

Related to to #4930

If you have a HeaderMenu open, and you click a HeaderGlobalAction, the header menu does not close. This can result in weird cases where multiple menus are open.

Is this issue related to a specific component?

UIShell

What did you expect to happen? What happened instead? What would you like to
see changed?

Normally if you click outside the menu it closes, it doesn't in this case.

What browser are you working in?

Chrome

What version of the Carbon Design System are you using?

carbon-components-react: 7.9.0

What offering/product do you work on? Any pressing ship or release dates we
should be aware of?

IBM Cloud Shell, No pressing dates

Steps to reproduce the issue

1. Check out the storybook https://react.carbondesignsystem.com/?path=/story/ui-shell--header-base-w-navigation-and-actions
2. Open the navigation menu
3. Click one of the actions - notice that the menu stays open