Google Sheets submissions don't allow underscores in the variable name

[danbjoseph]

@ivanradisson please note that Google Drive/Sheets functionality was removed from ODK Collect in Fall 2023.

Collect will stop connecting to Google Drive/Sheets in Fall 2023

In Fall 2023, we will remove Google Drive/Sheets functionality from ODK Collect. Users will no longer be able to download blank forms directly from Google Drive or send completed forms directly to Google Sheets. We are making this change to enable us to move faster on features that serve more users. We believe most people use Google Drive/Sheets because they see it as reducing the financial and technical cost for organizations to use ODK. But because Google Drive/Sheets were not designed to be…