Add project breakdown page

[AdityaHegde]

• Add subpage for project breakdown
• Add link in billings settings page
• Add breadcrumb for project breakdown page
• To test locally use this: https://github.com/rilldata/synthetic-rill-cloud-metrics
• Add a devtool command for the above so that local setup is easier.
• UX feedback
  • Error page when metrics project is not configured or is down.
  • Breadcrumbs situation.
  • Measure/dimension labels for the dashboard

[ericpgreen2]

Regarding the https://github.com/rilldata/synthetic-rill-cloud-metrics repository:

1. I'm struggling to follow the instructions to generate the data. It doesn't seem like the go run ./cli main.go instruction is accurate.
2. In the PR to setup Cloud e2e tests, I'm putting test GitHub repositories in web-admin/tests/setup/git/repos. Can you add a script in web-admin/tests/setup that pulls the repo into that location & runs the command to generate the data?
3. Can we make this repo public? Any contributors to the Rill codebase should be able to test this.

[ericpgreen2]

We should add error handling for the billing/metrics-project-credentials API request. I know this "metrics project not configured" error should not happen in production, but if there's any error, it should be displayed on the screen.

[AdityaHegde]

Agreed. This is on the back burner for getting design. Lets do that in a separate PR.

[ericpgreen2]

At a minimum, could you put the error in basic red text? I was confused until I opened up the browser console

[AdityaHegde]

@ericpgreen2 The repo was just a mirror of code I had during development. We are looking at ways to make it simple for local testing. Most probably a devtool command will be added that can be reused for E2E