fix(test): disable failing drag and drop test on mac and windows (#5575)

test/page-drag.spec.ts

@@ -119,8 +119,9 @@ describe('Drag and drop', (test, {browserName}) => {
     });
   });
 
-  it('should respect the drop effect', (test, {browserName}) => {
+  it('should respect the drop effect', (test, {browserName, platform}) => {
     test.fixme(browserName === 'chromium', 'Chromium doesn\'t let users set dropEffect on our fake data transfer');
+    test.fixme(browserName === 'webkit' && platform !== 'linux', 'WebKit doesn\'t handle the drop effect correctly outside of linux.');
     test.fixme(browserName === 'firefox');
   }, async ({context}) => {
     const page = await context.newPage();