Remove Test.allActionsComplete

Test.isActionPending does the same thing and it's confusing to have both. Remove allActionsComplete and update tests.

@bug W-1850370@

@rev goliver@
Safari test fix: IterationUITest

Safari didn't like finding the button by class name, so reference the button a different way.

@bug W-1849606@

@rev mkohanfars@
Merging origin/tbliss/master-pending-safari-iteration-testfix into master