multiple automated tests suites updates + add missing polling specs and move them with old ones to a polling test suite (#10766)

* updating old tests + collecting more snapshots [WIP]

* updates old test suites and collects more visual regressions screenshots

* remove snapshots and their collection temporary

* run tests from packages.json

* update test execution command/export constants from .env to core/constants.js

* update tests/puppeteer/README.md file

* update LOOP_INTERVAL variable call and assign timeouts to the webcam share spec

* redefine waitForSelector func in page.js, update chat test suite specs and add poll chat message test spec

* Merge remote-tracking branch 'upstream/develop' into updating-old-tests-visual-with-visual-regressions

* update webcam test specs collecting videoPreviewTimeout and use it to wait for videoPreview selector

* update custom parameters test suite

* update breakout test suite

* update webcam layout test suite

* update multiusers test suite

* update notifications test suite

* update presentation test suite

* whiteboard test suite

* screenshare test suite

* update sharednotes test suite

* user ELEMENT_WAIT_TIME variable from timeouts constants.js

* list TEST CONSTANTS by category

* add poll test suite and assigns the right unassigned timeouts

* set test pages to headless