Data migration: Update user_type value for humans

Merged Pavel Shutsin requested to merge 386474-make-user-user_type-not-nullable-part-3 into master

What does this MR do and why?

This MR scheduled a data migration for updating user_type of all existing human users to be 0 instead of nil as part of #386474 (closed) This MR addresses point 3.

Previous episodes:

How to set up and validate locally

  1. Check list of human users
  2. bundle exec rake db:migate
  3. Make sure data migration is finished in sidekiq
  4. Check hat list of human users didn't change.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #386474 (closed)

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