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This PR removes the usage of Material widgets from unit tests of `CupertinoAlertDialog`. Other than it being just wrong, it also introduces bad behavior, such as the scroll view can't be overscrolled so that the overscroll behavior can't be tested. * Since there are no longer M2 or M3 variants of tests, I straight up rewrote the unit tests for "default look" with similar tests as those of `CupertinoActionSheet` ([here](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/action_sheet_test.dart#L21)) This PR also replaces `showCupertinoModalPopup` with `showCupertinoDialog` in `CupertinoAlertDialog`'s example code. The former should only be used by `CupertinoActionSheet`, which has a different animation from the correct `showCupertinoDialog`.
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