Queueing a report to be sent via email doesn't work

[jarcoal]

Currently when you try and have a report emailed, the request from the send modal to the server fails:

The expectation that isn't being met is that the front-end isn't passing an "X-Requested-With" header, which is causing this logic to fail:

sql-explorer/explorer/views/email.py

Lines 12 to 20 in 910cb71

	def post(self, request, query_id, *args, **kwargs):
	if request.headers.get("x-requested-with") == "XMLHttpRequest":
	email = request.POST.get("email", None)
	if email:
	execute_query.delay(query_id, email)
	return JsonResponse(
	{"message": "message was sent successfully"}
	)
	return JsonResponse({}, status=403)

I believe this was caused by this commit, which switched from using jQuery, which emits an X-Requested-With header, to fetch, which does not:

c4278c2#diff-c2106f38c65afec174958944fc7f073b461b2ae16929467de22e49e76e6055e4L56-R63