Create more subtests for StylePropertyMap tests, to make it clearer which checks are actually failing.
Pull request: https://github.com/WebKit/WebKit/pull/7509
Committed 257759@main (f4a83c543d2b): <https://commits.webkit.org/257759@main> Reviewed commits have been landed. Closing PR #7509 and removing active labels.
<rdar://problem/103271349>
The export ran into a CI failure, due to making them actual tests and thus the duplicated tests become a problem: https://github.com/web-platform-tests/wpt/pull/37463#issuecomment-1347560278