adds visual regressions test with snapshots ready to use

...ton-html5/imports/ui/components/screenshare/component.jsx

...i/components/whiteboard/annotations/ellipse/component.jsx

...s/ui/components/whiteboard/annotations/line/component.jsx

...ui/components/whiteboard/annotations/pencil/component.jsx

...s/ui/components/whiteboard/annotations/poll/component.jsx

...components/whiteboard/annotations/rectangle/component.jsx

.../components/whiteboard/annotations/triangle/component.jsx

.../all-test-js-audio-join-audio-with-listen-only-1-snap.png

...s-breakout-join-breakout-room-and-share-screen-1-snap.png

..._image_snapshots__/all-test-js-chat-clear-chat-1-snap.png

...__image_snapshots__/all-test-js-chat-copy-chat-1-snap.png

...__image_snapshots__/all-test-js-chat-save-chat-1-snap.png

...mage_snapshots__/all-test-js-chat-send-message-1-snap.png

...l-test-js-chat-send-private-chat-to-other-user-1-snap.png

..._snapshots__/all-test-js-chat-send-public-chat-1-snap.png

...s-custom-parameters-ask-for-feedback-on-logout-1-snap.png

...hots__/all-test-js-custom-parameters-auto-join-1-snap.png

...ll-test-js-custom-parameters-auto-share-webcam-1-snap.png

...all-test-js-custom-parameters-auto-swap-layout-1-snap.png

...s__/all-test-js-custom-parameters-banner-color-1-snap.png