chore(components): upgrade LeafyGreen chat components COMPASS-9642 (#7610)

* Upgrade LG chat packages and remove unneeded overrides

* Remove removal of extra padding

* Remove unused ChatWindow style and title

* Remove InputBar wrapping div & padding correcting styles

* Fix messages height

* Update test to reflect new wording in disclaimer

* Override select and tokens in diagramming

* Fix tests by closing stream immediately

Author: kraenhansen