Signed-off-by: girlbossceo <june@girlboss.ceo>

Signed-off-by: girlbossceo <june@girlboss.ceo>

Only 174 errors left!

Remove it from request handler since there's already the context of the
request path, added through TraceLayer.

Should make the code a little bit easier to read.

Co-authored-by: Timo Kösters <timo@koesters.xyz>

json_body is used in places that need authentication. In
case an unknown field is set, Ruma doesn't parse the field
and so doesn't give an error on invalid UTF-8. But Conduit
has parsed and on error makes json_body None. Return an
error to the client instead of generating an internal error.