[golden_toolkit] Add teardown surface size, physical size and pixel ratio

[jamesblasco]

The current implementation changes some properties for the test window and does not set them back to the default values. This is making some other test to fail as they use the default screen size provided by the test framework.

flutter_glove_box/packages/golden_toolkit/lib/src/testing_tools.dart

Lines 117 to 128 in b8cf574

	Future<void> _pumpAppWidget(
	WidgetTester tester,
	Widget app, {
	required Size surfaceSize,
	required double textScaleSize,
	}) async {
	await tester.binding.setSurfaceSize(surfaceSize);
	tester.binding.window.physicalSizeTestValue = surfaceSize;
	tester.binding.window.devicePixelRatioTestValue = 1.0;
	tester.binding.window.textScaleFactorTestValue = textScaleSize;
	await tester.pumpWidget(

I would like to propose to add there the following:

    addTearDown(() async {
      await binding.setSurfaceSize(null);
      binding.window.clearPhysicalSizeTestValue();
      binding.window.clearDevicePixelRatioTestValue();
      binding.window.clearTextScaleFactorTestValue();
    });

So after the golden test is finished, the test values are rested to the default ones