The waitr click on the checkbox seems to be broken or is broken with
intend since the actual OOUI checkbox has an opacity of 0.
Additionally when_visible fails when the element is not present yet.
The the way to go here seems to wait for the element to be there
and then check for visibility.
Also made use of PageObject method for checkboxes, the name selector
and the link element.
Bug: T158074
Change-Id: I2c3d6d963c8bcdc420bfbc57c1c2380bce7ef2f1