Linear issue: [[ https://linear.app/comm/issue/ENG-1712/restyle-quotes-in-messages-to-match-new-designs | ENG-1712 ]]. Restyling the quotes with a darker tinted variation of the thread color. If the `threadId` is `null` the blockquote color will default to the gray color (what we currently have)
Next Steps:
# Update non-viewer blockquote message container color to be the base thread color