Description of problem:

When clicked on topology view's background if the projects dropdown is open, the UI crashes because of a TypeError (`TypeError: event.target.closest is not a function`) in `NamespaceMenuToggle` component.

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

1. Open projects dropdown
2. Click on topology view's background

Actual results:

UI crashes.

See attachement.

Expected results:

UI should not crash and the dropdown should get closed.

Reproducibility (Always/Intermittent/Only Once): Always

Build Details:

Additional info: