Ramp "intersect-resources" to 100% (third try)

[dreamofabear]

Fixes #25428. 1% ads regression appears fixed in canary after #29581.

[kristoferbaxter]

Restarted End to End tests, approving.

[dreamofabear]

The protocol adapters e2e test failure is actually legitimate. The intersection callback happens before amp-script.css is loaded, so it detects the amp-script element as having height: 0. This means layoutCallback() is never called.

I think the core issue is that amp-script.css technically causes content jumping by resizing the element.

[samouri]

The protocol adapters e2e test failure is actually legitimate. The intersection callback happens before amp-script.css is loaded, so it detects the amp-script element as having height: 0. This means layoutCallback() is never called.

There's a larger pattern that this exposed regarding a new requirement w/ intersect-resources. Before IO, measures were always done after build. With IO, measures will all likely happen pre-build, and therefore we need elements to have correct width/height even before build (for those that don't explicitly mutate).

New case: #30167

[dreamofabear]

Good catch. This is actually a coincidental invariant since "size change after build" can cause CLS.

[samouri]

Different bug but also related to IO. This one about using an outdated premeasure and incorrectly skipping layout:

#30188