WPT layout tests make up for over half of the overall layout test runtime on macOS and iOS bots. This is affecting throughput in CI, and incurs a large cost for bot watchers to maintain. In an attempt to alleviate those issues, let's consider restricting these test to the mac-wk2 configuration in CI. Developers would be able to continue running these locally without disruption.
<rdar://problem/102913568>
Pull request: https://github.com/WebKit/WebKit/pull/7082