[web] unskip canvaskit tests that pass now (flutter#140480)

Unskip a few CanvasKit tests that pass now.

Author: yjbanov

dev/bots/test.dart

@@ -158,30 +158,14 @@ const Map<String, List<String>> kWebTestFileKnownFailures = <String, List<String
     // These tests are broken and need to be fixed.
     // TODO(yjbanov): https://github.com/flutter/flutter/issues/71604
     'test/painting/decoration_test.dart',
-    'test/material/text_selection_theme_test.dart',
-    'test/material/date_picker_test.dart',
     'test/rendering/layers_test.dart',
     'test/painting/text_style_test.dart',
-    'test/widgets/image_test.dart',
-    'test/cupertino/colors_test.dart',
-    'test/cupertino/slider_test.dart',
     'test/material/text_field_test.dart',
-    'test/rendering/proxy_box_test.dart',
     'test/widgets/app_overrides_test.dart',
-    'test/material/calendar_date_picker_test.dart',
-    'test/material/ink_paint_test.dart',
-    'test/rendering/editable_test.dart',
-    'test/cupertino/dialog_test.dart',
-    'test/widgets/shape_decoration_test.dart',
-    'test/material/time_picker_theme_test.dart',
-    'test/cupertino/picker_test.dart',
-    'test/material/chip_theme_test.dart',
-    'test/cupertino/nav_bar_test.dart',
     'test/widgets/performance_overlay_test.dart',
     'test/widgets/html_element_view_test.dart',
     'test/cupertino/scaffold_test.dart',
     'test/rendering/platform_view_test.dart',
-    'test/cupertino/context_menu_action_test.dart',
   ],
 };