Fix DomProgressEvent constructor (flutter#37849)

DomProgressEvent should have a non-synthetic constructor that accepts
a String to match the MDN definition:
https://developer.mozilla.org/en-US/docs/Web/API/ProgressEvent/ProgressEvent.
It should also have a JS name that points to ProgressEvent. Lastly,
image_golden_test is modified to use the parameter values from before the
static interop migration:
https://github.com/flutter/engine/blame/9cb49937575fa9b6774e9dc471ce638e151ccf47/lib/web_ui/test/canvaskit/image_golden_test.dart

Author: srujzs

lib/web_ui/lib/src/engine/dom.dart

@@ -193,9 +193,11 @@ DomEvent createDomEvent(String type, String name) {
   return event;
 }
 
-@JS()
+@JS('ProgressEvent')
 @staticInterop
-class DomProgressEvent extends DomEvent {}
+class DomProgressEvent extends DomEvent {
+  external factory DomProgressEvent(String type);
+}
 
 extension DomProgressEventExtension on DomProgressEvent {
   external double? get loaded;

lib/web_ui/test/canvaskit/image_golden_test.dart

@@ -229,7 +229,7 @@ void _testForImageCodecs({required bool useBrowserImageDecoder}) {
       final Future<ui.Codec> futureCodec =
           skiaInstantiateWebImageCodec('http://image-server.com/picture.jpg',
               null);
-      mock.sendEvent('load', DomProgressEvent());
+      mock.sendEvent('load', DomProgressEvent('test progress event'));
       final ui.Codec codec = await futureCodec;
       expect(codec.frameCount, 1);
       final ui.Image image = (await codec.getNextFrame()).image;
@@ -277,7 +277,7 @@ void _testForImageCodecs({required bool useBrowserImageDecoder}) {
       try {
         final Future<ui.Codec> futureCodec = skiaInstantiateWebImageCodec(
             'url-does-not-matter', null);
-        mock.sendEvent('error', DomProgressEvent());
+        mock.sendEvent('error', DomProgressEvent('test error'));
         await futureCodec;
         fail('Expected to throw');
       } on ImageCodecException catch (exception) {
@@ -317,7 +317,7 @@ void _testForImageCodecs({required bool useBrowserImageDecoder}) {
       try {
         final Future<ui.Codec> futureCodec = skiaInstantiateWebImageCodec(
             'http://image-server.com/picture.jpg', null);
-        mock.sendEvent('load', DomProgressEvent());
+        mock.sendEvent('load', DomProgressEvent('test progress event'));
         await futureCodec;
         fail('Expected to throw');
       } on ImageCodecException catch (exception) {