adds notifications test (saved settings/private and public chat)

...ebutton-html5/imports/ui/components/nav-bar/component.jsx

...rts/ui/components/nav-bar/settings-dropdown/component.jsx

...ui/components/settings/submenus/application/component.jsx

...luebutton-html5/imports/ui/components/toast/component.jsx

bigbluebutton-html5/tests/puppeteer/notifications.test.js

...luebutton-html5/tests/puppeteer/notifications/elements.js

...tton-html5/tests/puppeteer/notifications/notifications.js

bigbluebutton-html5/tests/puppeteer/notifications/util.js