React 19: test-utils have been removed

[tlabaj]

Describe the enhancement or change
Remove use of the deprecated react-dom\test-utils from our repo since it is removed in React 19

quick earch shows it is use here

patternfly-react/packages/react-core/src/components/Alert/__tests__/Alert.test.tsx

Line 4 in 7e33336

import { act } from 'react-dom/test-utils';

Please verify it is not used elsewhere in the codebase.

[thatblindgeye]

Closing as this was resolved by #11508