Fix user archival

[wilco375]

Summary

Fixes #428

User archival failed because a form can only have one response per user, but if multiple responses are archived they all get user id 0, which caused this validation to fail. The validation now explicitly excludes the archived user (id 0). I also changed the user update statement to throw an error once an update fails. This makes it more clear where the error occurs. Regardless of this, user archival will fail anyways if the update fails because of foreign key constraints once the user is attempted to be deleted (as has been happening until now).

[sentry-io[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ ActiveRecord::RecordInvalid: Failed to update Form::Response record (ID: 49) Sidekiq/UserCleanupJob View Issue

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