Disable post-submit failures (#100308)

Author: Piinks

packages/flutter_goldens/test/flutter_goldens_test.dart

@@ -283,7 +283,9 @@ void main() {
           '--work-dir', '/workDirectory/temp',
           '--test-name', 'golden_file_test',
           '--png-file', '/workDirectory/temp/golden_file_test.png',
-          '--passfail',
+          // TODO(Piinks): Re-enable once https://github.com/flutter/flutter/issues/100304
+          // is resolved.
+          //'--passfail',
         ],
         null,
       );

packages/flutter_goldens_client/lib/skia_client.dart

@@ -191,7 +191,9 @@ class SkiaGoldClient {
         .path,
       '--test-name', cleanTestName(testName),
       '--png-file', goldenFile.path,
-      '--passfail',
+      // TODO(Piinks): Re-enable once https://github.com/flutter/flutter/issues/100304
+      // is resolved.
+      //'--passfail',
     ];
 
     final io.ProcessResult result = await process.run(imgtestCommand);