Issue #2822382 by voleger, pfrenssen, erozqba, RytoEX, borisson_, sidharthap, Jo Fitzgerald, shashikant_chauhan: Make every  property protected on classes extending BrowserTestBase and KernelTestBase

(cherry picked from commit 69501f30)

Issue #2747167 by michielnugter, dawehner, Lendude, mglaman, Mac_Weber, Jo Fitzgerald, klausi: Convert first part of web tests of views_ui

Issue #2780583 by Lendude, joachim, Nitebreed: Views field token replacement patterns aren't showing in area handlers admin form