Apparently, there was a bug in notify_bot_owner_on_invalid_json, where
we didn't reraise the JsonableError.
We fix this with a refactoring that makes the exception layering
clearer as well.
There are only a handful of non-JSON webhooks that wouldn't
benefit from the notify_bot_owner_on_invalid_json feature.
Specifically, these are the webhooks where the third-party product
uses another format, whether it be HTML form-encoded, XML, or
something else.
Tweaked by tabbott to correc the list of excluded webhooks.
Our webhook-errors.log file is riddled with exceptions that are
logged when a webhook is incorrectly configured to send data in
a non-JSON format. To avoid this, api_key_only_webhook_view
now supports an additional argument, notify_bot_owner_on_invalid_json.
This argument, when True, will send a PM notification to the bot's
owner notifying them of the configuration issue.