Setup Cloud e2e test framework and write first tests

[ericpgreen2]

This PR advances our web-admin Playwright project.

The following "global setup" is performed before tests are run:

• Runs rill devtool start e2e
• Pulls our rill-examples GitHub repo (to deploy and test against)
• Authenticates the [email protected] user
• Deploys the OpenRTB example project

The following test fixtures are added:

• anonUser: removes the [email protected] user cookies
• cli: logs-in to the Rill CLI
• organization: creates an org named "e2e"
• project: deploys the OpenRTB example project

The PR also includes some first tests:

• Basic navigation to the homepage by unauthenticated & authenticated users
• Org creation
• Project deployment
• Navigation to an Explore dashboard & assertion of data

When developing tests, here's the recommended way to set up your environment:

// Terminal 1
rill devtool start e2e --except ui --reset

// Terminal 2
npm run preview -w web-admin // or npm run dev -w web-admin

// Terminal 3
cd web-admin
E2E_SKIP_GLOBAL_SETUP=true npx playwright test -g "Your test"

TODO

• Move project deployment from fixture to a Playwright project
• https://github.com/rilldata/rill-private-issues/issues/1032