lighthouse 8.0.0 on Node.js NPM

We expect this release to ship in the DevTools of Chrome 93, and is already in PageSpeed Insights!

Notable changes

The Performance Category had a number of scoring changes to align with other performance tools and to better reflect the state of the web.
- The Performance Score has been reweighted (#12577)
- The TBT and FCP score curves have been updated (#12576, #12556)
- CLS has been updated to its new, windowed
  definition (#12554)
See the v8.0 Performance FAQ for more detail.
The report includes a new metric filter. Pick a metric to focus on the opportunities and diagnostics most relevant to improving just that metric:
The Lighthouse Treemap is now available across all the major Lighthouse clients. If your site exposes source maps to Lighthouse, look for the "View Treemap" button to see a breakdown of your shipped JavaScript, filterable by size and coverage on load.

The new audit csp-xss has been added to Best Practices to evaluate Content Security Policies and suggest ways of making them more secure. This can be a challenging audit to pass depending on hosting environment and page content, so for now it is unscored (#12514, #12551)

Legacy metrics estimated-input-latency and first-cpu-idle have been deprecated, unweighted, and hidden since Lighthouse 6. They have now been removed (#12553)
Starting with Node 13, Node is built with full-icu by default, so the very large intl polyfill has been removed from Lighthouse's dependencies. See the readme FAQ if you're stuck with small-icu but need localization support (#12426)
Long-time audit uses-webp-images has a new ID, modern-image-formats. WebP is now rather mainstream, and this frees the audit to start including details on other cutting-edge image formats in the future (#12535)
The image-elements artifact has been restructured for clarity (#12568)

Support for auditing user flows (#11313)