Adjust the Error for logging Duo Pro not eligible users error
What does this MR do and why?
Related to: https://gitlab.com/gitlab-org/gitlab/-/work_items/455163
In this MR, we adjust the error for logging.
Adjustment:
Change not_eligible_users
to error
, to synchronize with other errors and enable us to query for json.response_type: error
all at once.