When the integration was originally rewritten, support for the
deprecated webhook payloads was removed. We later noticed that some
people using Zulip were still using versions of Sentry that required
the older integration code.
Thus this commit adds back the older integration code and whenever the
Sentry webhook payload does not have a "data" field (which must be
present in all modern payloads as per the documentation at
https://docs.sentry.io/workflow/integrations/integration-platform/webhooks)
we will use the older Sentry integration code.
Signed-off-by: Hemanth V. Alluri <hdrive1999@gmail.com>
Hemanth V. Alluri