fix(e2e): fix flaky DataContracts owner assignment crashing on undefined displayName (#27592)

* increase data contracts test timeout

* fix contract form with owner field

---------

Co-authored-by: Shrabanti Paul <shrabantipaul@Shrabantis-MacBook-Pro.local>

Author: shrabantipaul-collate

openmetadata-ui/src/main/resources/ui/playwright/e2e/Pages/DataContracts.spec.ts

@@ -182,15 +182,15 @@ test.describe('Data Contracts', () => {
         // Add owner using created user to verify displayName is shown in UserTag
         await addOwnerWithoutValidation({
           page,
-          owner: user.responseData.displayName,
+          owner: user.getUserDisplayName(),
           type: 'Users',
           initiatorId: 'select-owners',
         });
 
         // Verify the UserTag shows the user's displayName (not name)
         await expect(page.getByTestId('user-tag')).toBeVisible();
         await expect(
-          page.getByTestId('user-tag').getByText(user.responseData.displayName)
+          page.getByTestId('user-tag').getByText(user.getUserDisplayName())
         ).toBeVisible();
       });