[Pixi] Pixi should highlight that the CLS metric is evolving

[nainar]

See https://web.dev/evolving-cls/ for reference

We should show a "Did you know?" section while the results are loading that point to the above link and call out that the way CLS is measured has change.

Copy: The Chrome Speed Metrics Team has changed the way CLS is measured to be more fair to pages that are open for a long time. See https://web.dev/evolving-cls/ for more details

[sebastianbenz]

What are other links we could show while waiting for the result? //cc @patrickkettner

[patrickkettner]

any idea what you want it to look like? Something like this?

[nainar]

The suggestion was here ^

[patrickkettner]

ah! missed that part of your comment. Thank you