use the new endpoint from cbc proxy. create a new task that just
serializes the event and sends it across rather than sending a template
and the broadcast message.
some changes to serialize to make it json friendly etc. it also expects
sent_at and transmitted_finishes_at to always be set (we set them in the
code but don't enforce it n the DB right now), as they're required by
utils template. not sure whether we'll update db constraints to be more
strict or utils template to be more permissive just yet, wait until we
find out more about the requirements of the CBCs we integrate with.
we won't let trial mode services send real broadcasts, and it's helpful
for users to see the flow of messages without having to have a second
person with them
spent WAY too long trying to figure out why my user wasn't being created
in tests. the user isn't created if their email already exists in the
system, but email isn't a required field when creating!
Note: I tried just removing the check to see if the user already exists,
but 16 tests try and create duplicate users. I'm of the belief we should
just fix all those tests but I didn't have the energy for it right now
