feat(lobby/prejoin/native): style updates (#12615)

* feat(conference/native): update indicator styles

* feat(prejoin/native): removed unnecessary styles

* feat(mobile/navigation): fixed header buttons style

* feat(mobile/navigation): fixed linter

* feat(base/modal): order props alphabetically

* feat(base/ui): added ripple color for tertiary button

* feat(prejoin): removed autoFocus from input and adjusted content

* feat(conference): adjusted RaisedHandCountLabel and added extra code spaces

* feat(prejoin): fixed content to fit tablets

* feat(conference): moved header button styles to navigation styles

* feat(mobile/navigation): updated header navigation button styles

* feat(prejoin): updated elements width, removed left inset

feat(base/ui/native): replaced react native TextInput component with our native Input component

Remove unused icons
Remove fill none from icons
Rename some icons

Co-authored-by: Calinteodor <calin.chitu@8x8.com>
Co-authored-by: Robert Pintilii <robert.pin9@gmail.com>