[Grid] Introduce dynamic-subgridded-item-height.html to WPT
This test was discovered as a regression to recent changes in Blink's
subgrid MinMaxSizes cache, which will be reintroduced later.
Bug: 40946243
Change-Id: I6697f827b023c3a1483c002d94e511f20bbba75e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5551624
Commit-Queue: Ethan Jimenez ethavar@microsoft.com
Reviewed-by: Alison Maher almaher@microsoft.com
Cr-Commit-Position: refs/heads/main@{#1303794}