Skip shader noise test for now

Author: davepagurek

test/unit/visual/cases/noise.js

@@ -25,5 +25,7 @@ visualSuite('Noise', function() {
     }, { p5 });
     p5.filter(shader);
     screenshot();
-  });
+  }, { skip: true });
+  // TODO(dave): Figure out why the noise shader looks different on CI and
+  // re-enable this test
 });