Add children to button mock

[m-bert]

Description

This PR ports #4048 behavior to our current setup.

Test plan

import {fireEvent, render} from '@testing-library/react-native';
import {Text} from 'react-native';
import {RectButton} from 'react-native-gesture-handler';

test('Trigger press by text', () => {
  const onPress = jest.fn();
  const {getByText} = render(
    <RectButton onPress={onPress}>
      <Text>Press Me</Text>
    </RectButton>,
  );

  fireEvent.press(getByText('Press Me'));

  expect(onPress).toHaveBeenCalled();
});

[Copilot]

Pull request overview

This PR updates the React Native Gesture Handler Jest button mocks so mocked button components can render their children, enabling tests to query and press buttons via nested text content (ported from #4048).

Changes:

• Update the RawButton mock to accept children.
• Render children inside the mocked TouchableNativeFeedback (fallback to an empty View when absent).

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