* Fix bug in challenge tags not converted to normal tags after challenge ended/deleted
* Added test cases to test bug fix
* Set tag.challenge from String to Boolean in tag model schema
* Update existing test with tag challenge set to boolean instead of string
* Added migration file for converting tag challenge field from string to bool
* Implement suggestions from ilnt
* Use mongoose instead of Mock in migration
* Change from update to bulkwrite
* update users individually
Co-authored-by: Matteo Pagliazzi <matteopagliazzi@gmail.com>
