Resolve "Backend/Frontend - Platform - Authentication Setup"

HEY, HEY LISTEN! 🧚

Okay dokie big one here, for the reviewer there's a few things to should cover before you start reviewing, since this also covers a few different areas:

• Changes to the pipeline:
  • Changed test image to a lighter weight one which has chrome and node by default rather than using a chrome service on a node image, this should reduce the amount of storage we're using preventing runner out of storage error.
  • Setup so that the pipeline will only run on merge requests with changes to the frontend folder.
  • Changed the node image.
• Added in authentication
  • Followed a similar setup to passport.js which means we can easily add and remove different authentication strategies
  • I created a set of routes that we reuse throughout the different strategies.
    • This should 404 when using an invalid strategy.
    • If no redirect_url is supplied throws a 200

To Test

• You're gonna need a new .env covering the provider keys, it's shared in the teams chat.

Closes #33 (closed)