v6 chatbot - Replace AutoTextArea from 'react-textarea-auto-witdth-height'

[rebeccaalpert]

Ansible Lightspeed reports that this violates their Content Security Policy directive. We should investigate a homebrew or different third-party solution.

[rebeccaalpert]

I asked Tami to test if the PatternFly textarea triggers this error and it doesn't, so that's a good sign. Our primary challenge with this will be to get it as close as possible to what we have now.