Chatbot: enhance resource inclusion to chats via tagging with '#'

[kaylachumley]

follow up to #901

jira dev issue

implement updated MessageBar pattern per the Genie user input concepts: https://www.figma.com/design/lJ5s1z11E4Q2Bp6kD3TE0W/Red-Hat-Project-Genie?node-id=353-5202&p=f&m=dev

-typing a '#' opens a menu of resources which could be selected

-selecting a resource adds an inline styled snippet representing the selection in the input

[kaylachumley]

label to indicate that # inclusion has been called