This reverts commit 0b216f7a.

This adjusts some of the names in the PlatformMenuBar to be more consistent with the rest of the API.

Matching engine PR is flutter/engine#32433

I noticed that AnimatedModalBarrier didn't have the onDismiss callback that ModalBarrier does, and so I added that, and while I was at it, I updated the unit tests to perform all of the tests that are done on ModalBarrier also on AnimatedModalBarrier. The tests are unchanged, other than using AnimatedModalBarrier instead.

Co-authored-by: Michael Goderbauer <goderbauer@google.com>

* Use single quotes for `dartSdkVersionBounds`

* Update update_packages_test.dart

* Update test_project.dart

* Update tests_project.dart

* Update compile_error_project.dart

* Update hot_reload_with_asset.dart

* Update break_on_framework_exceptions_test.dart

* Update basic_project.dart