Add FunctionalJavascript tests for Views UI parts of views plugins

Added UI tests for views handlers provided by address module.
There are 3 cases, each for field, filter and sort handlers.

During test development I found issue with ajax on administrative_area filter handler: when filter is configured right after it's added the ajax in options form does not behave correctly. When country source is selected the options form is closed and user is taken to previous filters selection screen. This happens because ajax in form was initiated during views ajax call and it has wrong url, so I checked how views module does this and found web/core/modules/views/src/Plugin/views/field/EntityField.php:477 which does the trick.

Please let me know if I should change task description to include info on this issue.

Thank you!

Had to revert this from 2.0.x because it wasn't passing.

After update the code for Madrid administrative area became M as seen in vendor/commerceguys/addressing/src/Subdivision/SubdivisionUpdater.php:273
So I had to update test data and test should pass now

Thank you!

Automatically closed - issue fixed for 2 weeks with no activity.