Move setup_for_company column from user_preferences table to user_details.onboarding_status

Move this into user_details.onboarding_status_setup_for_company as a way to better group onboarding concerns.

• Ensure data team is aware of this move in case they need to adjust any analysis of this data.
• !178655 (merged) - Add new field to app/validators/json_schemas/user_detail_onboarding_status.json code that uses it/fills it. See #461404 (closed)
• Collect both fields before cutover per data team instruction. !179314 (merged)
• Backfilling/moving data for existing users (see !180602 (merged))
• Cutover to the new field after backfill has finished. (!184374 (merged) - workflowin review)