also str representation of unicode character is different.

This should detect any Business Template with non-migrated workflows.
Exclude the Business Template which is precisely made to test workflow
migration.

Migrate oauth2_session_refresh_interaction_workflow to new-style workflows.
This time, the migration should be complete.

This reverts commit e925dc0b.
This commit is breaking more than it is fixing. Revert until I have a
working version of this migration.