feat(a11y): Globally improve accessibility for screen reader users

Fix some errors. Remove @ts-ignores
Convert some files to TS
Remove some eslint-disables

Fix imports
Convert some files to TS

Fix imports

Use our component instead of atlaskit
Implement redesign
Add unmount animation
Change mount animation from external lib to CSS
Remove @atlaskit/flag
Remove react-transition-group
Add unmount animation on native
Remove AbstractNotification

Remove unnecessary @ts-ignores
Remove unnecessary eslint-disable

Remove global variables from files
Change type to interface

Use new TS config from @jitsi/eslint
Fix all lint errors

Remove unnecessary ts-ignores
Change any to actual types
Fix eslint rule

Updated indicator color and background color
Added border on thumbnails
Web and Native

* Make Jitsi WCAG 2.1 compliant

* Fixed password form keypress handling

* Added keypress handler to name form

* Removed unneccessary dom query

* Fixed mouse hove style

* Removed obsolete css rules

* accessibilty background feature

* Merge remote-tracking branch 'upstream/master' into nic/fix/merge-conflicts

* fix error

* add german translation

* Fixed merge issue

* Add id prop back to device selection

* Fixed lockfile

Co-authored-by: AHMAD KADRI <52747422+ahmadkadri@users.noreply.github.com>