Link accounts and stop account creation from sign in page

[erikguntner]

Closes #703

What changes did you make?

• Refactored the existing /token endpoint and split it into '/google/sign_inand/google/sign_up`
• The /google/sign_up endpoint handles the creation of a user that signs up with Google. The endpoint will throw an error and delete the user created in AWS if the role is not provided or is incorrect.
• The '/google/sign_in` endpoint handles signing in a user that is created by Google. The endpoint will throw an error and delete the user created in AWS if an existing user is not found in the database because this means the user has not gone through the signup process yet.
• Updated the client to use the endpoints for sign up and sign in.
• Created a lambda function that links user accounts if the user first signed up with email and password and then signs in with Google.

Rationale behind the changes?

• We wanted the ability to link user accounts so those who are invited or decide they want to use the Google sign in after creating an account can do so.
• We needed a way to roll back user account creation if the user signed in with Google without going through the sign up process first.

Testing done for these changes

• I did manual testing using our database and AWS Cognito resource and going through the necessary user flows.

Screenshots of Proposed Changes Of The Website (if any, please do not screen shot code changes)

Visuals before changes are applied

Uploading Screen Recording 2024-06-18 at 3.54.43 PM.mov…

Visuals after changes are applied

This video shows how a user signing in with a Google account without signing up first will throw an error.
Uploading Screen Recording 2024-06-18 at 4.02.17 PM.mov…