Increase test timeout for metadata modification

Extended the timeout for the 'Sample Metadata Modification Workflow' integration test to 15 seconds to accommodate multiple YAML imports and ensure test reliability.

Author: edeno

src/__tests__/integration/sample-metadata-modification.test.jsx

@@ -407,5 +407,5 @@ describe('Sample Metadata Modification Workflow', () => {
     // Verify other data still intact
     expect(screen.getByLabelText(/^lab$/i)).toHaveValue('Test Lab');
     expect(screen.getByLabelText(/institution/i)).toHaveValue('Test University');
-  });
+  }, 15000); // 15 second timeout - imports YAML multiple times
 });