Validates the authentication attempt that is associated with the current step in the reset password flow.

Entitlements required: resetPassword (Reset password).

The validator must be called for each step, until only one step remains.
After a successful authentication, the step is marked complete and the API initiates the next step. The response indicates the number of steps that remain and the next step to continue. When only one step remains, call the PUT /v1.0/usc/password/resetter/{trxId} API to change the user's password and complete the transaction.