The Cockpit update test relies on scrolling the Cockpit left bar
to find the Software Updates page, but in Firefox 100, the scroll
bars disappear shortly after the last time you moved the mouse.
To deal with this, instead of looking for a scroll bar to scroll,
we'll click the search box in the left bar and hit 'up' to scroll
it to the bottom.
Signed-off-by: Adam Williamson <awilliam@redhat.com>