Reland "[CSS display:ruby*] Make the feature testable"

This is a reland of commit 163df85f899dfba3e54b5ff0fa3adaf88b712af2

Difference from the original CL:
* Add [Failure] expectation for block-ruby-004.html.

Original change's description:
> [CSS display:ruby*] Make the feature testable
>
> This CL changes the status of the runtime flag to "test", and updates
> test expectations.
>
> Tests in css/css-contain/ are going to be fixed soon.
>
> Bug: 880802, 1497899
> Change-Id: If1659f3c48e91dce8941dbb49e29f9ffa8466d45
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5003920
> Auto-Submit: Kent Tamura <tkent@chromium.org>
> Reviewed-by: Koji Ishii <kojii@chromium.org>
> Commit-Queue: Koji Ishii <kojii@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1222230}

Bug: 880802, 1497899
Change-Id: Ie9895e75d6334b6fd771073ca259e20fba2dbfdb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5019316
Auto-Submit: Kent Tamura <tkent@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1222759}