This avoids a potential unnecessary message.recipient fetch required by
is_stream_message(). is_stream_message() methods precedes the addition
of the denormalized is_channel_message column and is now unnecessary.
In practice, we usually fetch Message objects with `.recipient` already,
so I don't expect any notable performance impact here - but it's still a
useful change to make.
(cherry picked from commit 51cef01c29)
We must not intermix Markdown strings which are ready for the message,
with format strings which we intend to interpolate on.
(cherry picked from commit 575dd10f99)
We abstract away "near" vs "with" from the function names and
allow callers to specify whether they want a conversation_link,
ie, use the "with" operator. The default choice is "near".
