demographic survey: expectations from frontend do not match expectation from background script so incomplete survey results are being dropped from endpoint

[hamilton]

The background script expects the demographic survey to not have fields if a question goes unanswered, but the frontend does not have this requirement. As such, invalid surveys are hitting the tables with errors, causing surveys to drop when (for example) someone doesn't answer the age question in the survey.

If all questions are answered by a panel member, then the survey arrives at the pioneer-core survey table as expected.

Since this has apparently been an issue since we launched RS01, I put together a branch that should resolve this issue and align the frontend to the submission structure. It will not change the background script but instead refactors the demographic survey frontend to match the expectation the schema has.

This should be a top priority for fixing Tuesday morning when everyone is back.