This commit migrates all of our webhooks to use
check_send_webhook_message, except the following:
beeminder: Rishi wanted to wait on this one.
teamcity: This one is slightly more work.
yo: This one is PM-only. I am still trying to decide whether we
should have a force_private argument or something in
check_send_webhook_message.
facebook: No point in migrating this, will be removed as part of
#8433.
slack: Slightly more work too with the `channel_to_topics` feature.
Warrants a longer discussion.
This commit migrates all webhooks to use check_send_stream_message
instead of check_send_message. The only two webhooks that still
use check_send_message are our yo and teamcity webhooks. They
both use check_send_message for private messages.
TRELLO_MESSAGE_TEMPLATE and TRELLO_SUBJECT_TEMPLATE are
redundant. This commit removes them. Now, subjects don't end
in periods. And where a period is necessary in the message body,
one is appended at the end of the specific template for that
message.
I feel like getting notifications about a board's background being
changed isn't very useful information and could interrupt the flow
of other important information such as Card changes or movement,
so I think we should not support this event and
should simply ignore such payloads in the future.
"Local" datetimes are local to the server (or rather, are using
settings.TIME_ZONE), which in most cases is not what the recipient of the
message is expecting.