Development mode environments and Environment hibernation are now generally available (GA)

## Feature Feature [Development mode environments](https://docs.cloud.google.com/composer/docs/composer-3/create-environments#development-mode)and[Environment hibernation](https://docs.cloud.google.com/composer/docs/composer-3/hibernate-environments) are now generally available (GA). You can now create Managed Airflow (Gen 3) environments with Airflow 3 in development mode to test and develop DAGs before publishing them to production. You can hibernate development mode environments when you no longer need them. Hibernation reduces most environment costs to zero.