Submission "edit" only loads latest version version of form

[esmail]

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[jnm]

This is well described in https://github.com/enketo/enketo-express/issues/253 and probably should be moved to KPI, especially now that we have enough OpenRosa stuff there now to serve up form previews: #2487 (comment)

[jnm]

We fixed it in #3689, we un-fixed it in #3734, and we'll fix it again once we have a UI to let people decide which version they want to use when editing. I think the only choices will be the latest version of the form and the version in effect when the submission was created.

[jnm]

When we fix this again, we need to take into account that pyxform may have added new checks (for example, forbidding duplicate choice names) since people deployed their forms. We may need to disable these checks for internal JSON->XLSForm->XForm conversions. Hopefully we can avoid having to store a copy of the XForm XML alongside the AssetVersion JSON to safeguard ourselves from changes in pyxform behavior.

See also internal discussion: https://chat.kobotoolbox.org/#narrow/stream/6-Support/topic/Issues.20with.20submission.20edits/near/98844