a11y - Update page title when new message arrives

[rebeccaalpert]

The page title should be updated when a new message arrives (for when that tab isn't the active one)
Likewise, if the chatbot menu is closed and a new messages comes in, there should be a badge/some other means to notify that there's a new message

[rebeccaalpert]

Hey @asuwebdesign @kaylachumley @andrew-ronaldson - @thatblindgeye went through and did an awesome accessibility audit. This was one of his call-outs. I can update the page title. However, I'm going to need input from you on how we can add a badge or some other means of notifying users that there's a new message if the chatbot menu is closed. Let me know if you need a separate ticket to track design - happy to do whatever works for you.

[kaylachumley]

Related design issue: patternfly/patternfly-design-kit#762