Revert subtests removal for selection-direction.tentative.html #48267
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In this PR, we re-add the subtests removed at 15c5ae8. See discussion at #48258 for the reasoning why this test is valuable in WPT.
We add it as a separate new test file since it is not testing for behavior inside shadow DOM and the standardization of its behavior is separate to whether Selection.direction is specced/shipped. Hence, it should remain a tentative test until issue w3c/selection-api#177 is resolved.