Smoke tests for CoderDojo login flow

[Jeddf]

Task 1 of Epic #1290

What

Integraton smoke test for login flow for existing users.

Why

To give confidence that existing login flow is not broken when working through the Profile integration

How

• Cypress test hitting unmocked endpoints, to be run locally with full stack & db
• Use existing Selenium login page test as template

[Jeddf]

Ran the plan by @ArayB this morning and asked about getting my local db in shape

• Warned me that it's currently a 2gb+ mock data download
• He's figring out a more managable setup db script while I get started on the tests then we're going to jump back on a call to run the scripts and update zen repo docs.