Make sure auto expanded sections have contents

Ensure the section-toggle event runs by using toggle function

For alpha since the section-toggle event is triggered inside the page-loaded
event by the toggle event currentPage is not set - thus we need to introduce a
global more reliable function for accessing the current page

Cleanup toggle tests, add a new one

Bug: 55586
Change-Id: I46d29b8b11fa383447ccded5e05ff2ceaac24c1e
Merge "Make sure auto expanded sections have contents"