Uc91.2

NOTE: this merge request depends on UC91.1

This PR contains an update to the main flow and the alternate flow for UC91, and also contains the selenium tests for both the main and alternate flows. Now, when the form is submitted, the user's MID is displayed. When they log in, they are redirected to a new landing page. If they enter an email that is already in use, they are given an error message.

The test can be run with: mvn test -Dtest=AddPreRegisterPatientActionTest mvn test -Dtest=PreRegisterPatientTest