### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

`PORTS_CHECK_DOCKER_IMAGE` is not configurable which prevents ECS tasks from running on air-gapped environment



### Expected Behavior

`PORTS_CHECK_DOCKER_IMAGE` can be configured via configuration option to allow use of any available image 

### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

Run an ECS task in an environment where localstack/localstack is not available.

### Environment

```markdown
- OS: RHEL8
- Docker runtime version: Podman v4.2.0
- LocalStack: 1.3.1
```


### Anything else?

_No response_
try:
            safe_run([config.DOCKER_CMD, "rmi", "alpine"])
        except CalledProcessError:
            pass
        with pytest.raises(NoSuchImage):
            stdout, _ = docker_client.run_container(
                "localstack_non_existing_image_for_tests", command=["echo", "test"], remove=True
            )
    def test_running_container_names(self, docker_client: ContainerClient, dummy_container):
        docker_client.start_container(dummy_container.container_id)
        name = dummy_container.container_name
        assert name in docker_client.get_running_container_names()
        docker_client.stop_container(name)
        assert name not in docker_client.get_running_container_names()
    def test_is_container_running(self, docker_client: ContainerClient, dummy_container):