Add cypress tests

[sarah-witt]

• adds a cypress test for creating a user and logging in
• deletes the user from firebase
• currently looking into other places to put the script/config
• how to run tests:
  • create service account and put config file in cypress/config/: https://cloud.google.com/docs/authentication/getting-started
  • yarn cypress run

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[stefan-philip]

This is really cool! Great job Sarah

[jrosen081]

This looks super awesome!

[jrosen081]

Is this used? I don't fully know the lifecycle of cypress tests.

[sarah-witt]

What do you mean by "used"- like is the function called or the script used? The script is called before each run of the user creation test.