Completely hide collapsed table rows

[billdami]

When using the expandable rows component, a row's "expanded content" <tr> should ideally either be not rendered at all, or at the very least have a style or class on it that gives it display:none. There appears to be issues in glimmer preventing the first solution (not rendering it at all), and issues in <VerticalCollection> preventing the second solution (applying a style/class):

html-next/vertical-collection#247
html-next/vertical-collection#299

The error message mentioned in the above linked issues crops up when using the style/class solution and the user is expanding rows and then quickly scrolling a fair amount up and down the table, possibly only when quickly scrolling (usually pagination needs to be occurring for it to manifest as well).

If either issue is fixed, we should update this functionality accordingly.