fix: Move focus to newest item when using "scroll to bottom" button, transitions, and other follow ups to Chat component (#10172)
* fix usermessage text wrapping in thread story and focus newest item when pressing the scroll down button
* fix so tabbing from thread feedback buttons properly exits the thread
used to hit every toggle button group in the thread before exiting
* rename to Chat and Thread, make new prop unstable
* add transition to button, intl, and announce new item if inside the chat but outside the prompt field
* removing extranous story
* delete dupe files from bad merge and other copy pasta issues
* actually replace all instances of the prop ugh
* update to make focusWithin tracked at promptField level
* fix tests