launchConfirmExit function
Toggles the visibility of the confirmation exit modal.
This function calls updateIsConfirmExitModalVisible with the negated value of
isConfirmExitModalVisible to toggle the modal's visibility.
Example:
final options = LaunchConfirmExitOptions(
  updateIsConfirmExitModalVisible: (bool isVisible) {
    // Update visibility state here
  },
  isConfirmExitModalVisible: false,
);
launchConfirmExit(options);
// This will open the modal if it's currently closed, or close it if it's open.
Implementation
void launchConfirmExit(LaunchConfirmExitOptions options) {
  options.updateIsConfirmExitModalVisible(!options.isConfirmExitModalVisible);
}