Invalidate container queries on sibling changes

Rely on marking container elements for style recalc on nth-invalidations
if the evaluator has been invoked with a tree counting function.

If a container evaluator depends on tree counting function evaluation,
and we recalc style for it for whatever reason, we recompute the
CSSContainerValues. To avoid that we would have needed a different way
of invalidating the container than relying on style recalc.

Pull the sibling-index() dependency out of ComputeValue() to know when
we need to invalidate the container values for style() queries. There is
a pre-existing bug for style() queries for other units like rem units.
That will be fixed in a follow-up CL.

Bug: 40282719, 419454587

Change-Id: I84151cd0bf0438d108b2fc579b93abc9cfc7dec0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6578338
Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1464646}