InlineQuotePolicy: skip objects which already have an .inline-quote span
Related: https://gitlab.com/soapbox-pub/soapbox-fe/-/merge_requests/1016
Sometimes servers can federate an object which already has a <span class="quote-inline">
wrapper, but the URL doesn't match the quoteUri. This is okay and valid, and if a server sends it this way we will just trust them.