Revert "Add tests for scaffold drawer and end drawer" (#150045)

Reverts flutter/flutter#149383 as it caused failure for mac
framework_tests_impeller.

Author: yaakovschectman

dev/bots/check_code_samples.dart

@@ -342,6 +342,8 @@ final Set<String> _knownMissingTests = <String>{
   'examples/api/test/material/search_anchor/search_anchor.2_test.dart',
   'examples/api/test/material/about/about_list_tile.0_test.dart',
   'examples/api/test/material/selection_area/selection_area.0_test.dart',
+  'examples/api/test/material/scaffold/scaffold.end_drawer.0_test.dart',
+  'examples/api/test/material/scaffold/scaffold.drawer.0_test.dart',
   'examples/api/test/material/scaffold/scaffold_messenger.of.0_test.dart',
   'examples/api/test/material/scaffold/scaffold_messenger.0_test.dart',
   'examples/api/test/material/scaffold/scaffold_state.show_bottom_sheet.0_test.dart',