This is fixing a case where the test failed with strict mode violation,
but all the matched elements are not highlighted in the trace.
For example, all the buttons will be highlighted when the following line
fails due to strict mode violation:
```ts
await page.locator('button').click();
```
To achieve this, we mark elements during `querySelector` phase instead
of inside `onBeforeInputAction`. This allows us to only mark from inside
the `InjectedScript` and remove the other way of marking from inside the
`Snapshotter`.
Right now arrays preview yields all array elements. In case
of a sparse array with a single element on index 10000000,
this results in a large string that OOM Node.js.
This patch changes pretty-printing. For example:
```ts
// Given this array
const a = [];
a[10] = 1;
// Before this patch, pretty printing will yield:
"[,,,,,,,,1]"
// With this patch, pretty printing yields:
"[empty x 9, 1]"
```
The new array pretty-printing is equal to what Chrome DevTools
do to render sparse arrays.
Fixes#20347
