[7.x] [Screenshot mode] Create plugin to provide "screenshot mode" awareness (#99627)#100331

jloleysens merged 3 commits intoelastic:7.xelastic/kibana:7.xfrom

jloleysens:backport/7.x/pr-99627jloleysens/kibana:backport/7.x/pr-99627Copy head branch name to clipboard