[Test] Write UITest for MenuFlyoutItem Clicked/Command delegate

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Description

This is specifically needed for Catalyst to prevent regressions around this from happening again. In this case, the Selector used to fire the Clicked/Command Delegate was removed because the selector was made "static", which won't work. As far as I can tell, there are no UI Tests specifically invoking the selector, only for the bindings themselves to verify they were attached. So we need a way to invoke the selector to make sure it actually does the command.

#20699

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