[css-fonts] Add a test that src:local matches a single face, not a whole family. #50051
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This was discussed at some length several years ago in #28990, but the test there never got merged.
Given the time that has passed, it seemed cleanest to rewrite this as a new PR that simply adds the test we concluded was missing.
This test depends on having a locally-installed Arial font family, which is true across all current macOS and Windows versions, but may not be the case on other platforms; in that case it falls back to Ahem and should harmlessly "pass" without really testing anything.