Support variable test URLs

[chosak]

This commit modifies the list of URLs that get tested each night. Instead of testing a hardcoded list, the URLs to be tested are now read in from an external file. This file is downloaded from a secret URL which is stored in a GitHub repository secret named TEST_PAGES_URL (if this secret is undefined, the fallback behavior is to only test the root of the website).

In order to support the variable list of URLs, the dashboard design has been updated so that it always displays the (alphabetical) full list of URLs ever tested, but now includes a new column with the most recent report date.

Screenshots

@caheberer @sonnakim or others: any design suggestions on the column names? It feels a little more cramped now. Would it make sense to make a change something like this?

Another thought would be to add https://www.consumerfinance.gov to the header somehow and make all of the links relative.

Todos

• Add sorting to the URL and date columns.

Checklist

• PR has an informative and human-readable title
• Changes are limited to a single goal (no scope creep)
• Code can be automatically merged (no conflicts)
• Code follows the standards laid out in the development playbook
• Passes all existing automated tests
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Reviewers requested with the Reviewers tool ➡️

[caheberer]

I really like the suggested change to the column headings. I think it's clearer (and helpfully shorter!) :)

[sonnakim]

Agreed!
My other thought (unrelated to your request, so maybe this could be a separate effort) is that it would be nice to include an introduction explaining who we are and what this page is about, maybe including a brief explanation of what Lighthouse is, how these pages are chosen, etc.

[chosak]

Thanks @caheberer @sonnakim! I've made the column change. I like the idea for introductory text but would prefer to implement in a future PR.

[sonnakim]

Looks good!