Test screen reader alerts and keyboard navigation for admin search options

[kimisgold]

This issue refers to the admin global search and its toggle-able options panel. There have been recent updates that affect this issue, so please ensure the test installation has the latest from master.

Test the following:

• The user can navigate to the options toggle button and activate it via keyboard.
• When the button activates, screen readers should read out an "expanded" or "collapsed" status change on the button.
• When the button is "expanded" the user should be able to tab to the search options panel. Tabbing past the options should land the user on the search submit button.
• When the button is "collapsed", the options panel should no longer be keyboard accessible. The user should be able to tab between the options and submit buttons.

Please test in Firefox, Chrome, Safari, Edge, and a mobile browser using JAWS, NVDA, Voiceover, and Talkback if possible.