Enforce Lower Case Emails on User Schema

[dannyprikaz]

Overview

It was previously possible to create multiple users in the db with the same email if the email was input with inconsistent casing (e.g. jeff@example.com vs. Jeff@example.com). .toLowerCase() has been added in multiple places to prevent this from happening, but as a final safety/sanity check, adding lowercase: true to the userSchema in the backend should ensure that a user document is never stored with capital characters.

Action Items

• Add lowercase: true to userSchema in backend/models/user.model.js
• Add test to backend/models/user.model.test.js for the lowercasing of emails

Resources/Instructions

Mongoose Docs
This is issue is a part of the epic: #1456

[dannyprikaz]

This issue is on hold while waiting for #1955 because we need the user.model.test.js file before we can add the appropriate test.