Switch to `get_form_by_xmlns`
Switch to `get_form_by_xmlns`

https://github.com/dimagi/commcare-hq/pull/8288/files#r40048421

qedsoftware/commcare-hq,dimagi/commcare-hq,qedsoftware/commcare-hq,qedsoftware/commcare-hq,dimagi/commcare-hq,qedsoftware/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,qedsoftware/commcare-hq,dimagi/commcare-hq