Treat Enketo subdomain as a trusted CSRF origin #3731
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The change in #3707 requires that Enketo be able satisfy KPI's CSRF protection. This PR sets a CSRF origin that matches the session cookie domain (e.g.
.kobotoolbox.orgforkf.kobotoolbox.organdee.kobotoolbox.org), so that Django does not reject Enketo's requests with messages like:CSRF Failed: Referer checking failed - [https://ee.kobotoolbox.org/edit/ckPYrJVx?instance_id=bec48ff4-5a9e-42a0-98d0-49351a601508&return_url=false]() does not match any trusted origins.See also #2658.