[material_ui] Add material drawer tests removed from core framework - #12925

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Relocating drawer tests that are testing Material widgets into the
~~materials folder~~ Material UI package.

This test is listed under flutter#177415, but belongs under flutter#177414.
While flutter#177415 instructs against moving tests, these tests only test
materials widgets and should be moved per flutter#177414.

Following flutter#177414's guidance for tests that fundamentally test Material,
the tests are moved into the existing test/material/drawer_test.dart,
and the misplaced test/widgets/drawer_test.dart is deleted.


Note: this PR has been split, and the tests are being moved into
Material UI package flutter/packages#12925


Part of flutter#177415

This PR does not require any changes to the [flutter/tests] repo.


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