Flaky test(s) in GlOutsideDirective specs

It looks like at least one of the specs for GlOutsideDirective is flaky.

I am able to verify this locally (sometimes) on the following specs:

• given an arg -> works with click
• multiple instances on the same element -> calls only the inner-most instance
• given a callback that throws -> still calls other listeners
• given a callback that throws -> logs the error to the console

I suspect there's a race, perhaps for the click event to bubble up vs making assertions. This needs investigation.