WebUI tests: Add test case to cover user ID override feature
    
    The test case includes adding an user ID override to Default Trust View
    and adding the ID override to some IPA group.
    
    Ticket: https://pagure.io/freeipa/issue/8416
    
    Signed-off-by: Serhii Tsymbaliuk <stsymbal@redhat.com>
    Reviewed-By: Petr Vobornik <pvoborni@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>