[Gardening][site-isolation] Attempt #4 Enable more tests to run in si…

…te-isolation

rdar://127515199
https://bugs.webkit.org/show_bug.cgi?id=273715

Unreviewed test gardening.

* LayoutTests/platform/mac-site-isolation/TestExpectations:

Canonical link: https://commits.webkit.org/278516@main