Add e2e framework and initial spec

[alisman]

No description provided.

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/htan/htan-portal-nextjs/3snezgY6uAz9m89eL7LvFar3hiRr
✅ Preview: https://htan-portal-nextjs-git-e2e-htan.vercel.app

[alisman]

@adamabeshouse can you try installing and running this?
@inodb once we have this going, seems like it's relatively simple to use github actions to run these tests against the Vercel preview deployments.