BUG: Ensure student role is default for all users

[sangitakunapuli]

Summary

There are 3 roles in proj-rec: student, professor, and admin. All users can be students, but not all users can be admins/professors automatically. Thus, we should ensure that all users are designated as students when they first log in.

Expected Behavior

When a user authenticates and logs in for the first time, they should automatically be given the student role.

Current / Observed Behavior

Currently, when users join for the first time, they are not given any roles except user (and admin if they are part of admin emails).

Steps to Reproduce

1. Navigate to the deployment of proj-rec, or run it locally
2. Click log in with a new email
3. If admin, click to see all users and you can see that the new user is not a student or professor by default.