WebUI tests: Change navigation tests to find menu items using data-name instead of href
    
    Since menu pseudo-links was replaced with real one, navigation tests must be changed to not use href
    for searching items.
    
    Ticket: https://pagure.io/freeipa/issue/7137
    
    Signed-off-by: Serhii Tsymbaliuk <stsymbal@redhat.com>
    Reviewed-By: Petr Vobornik <pvoborni@redhat.com>