Share a cache for the two calls during builds
Share a cache for the two calls during builds

These were both calling XForm(...).get_questions, with the only
difference being that one didn't want groups.  That meant that that very
expensive call happened twice (per form!), with trivial differences.

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