### Is there an existing issue for this?

- [X] I have searched the existing issues and read the documentation

### Question

A [recent commit](https://github.com/localstack/localstack/commit/f41b25cc8d68e97ce8eacd4374ded4a8072e50f6#diff-368e25a43c4a3200ecb9ae21e7b2a94da05d8eb24680bd6c2a37ee0e275bcd0aL67) scrapped the `{"features:initScripts":"initialized"}` feature that my team was relying on to bootstrap our development environment.

Basically we are putting a provisioning script in `/docker-entrypoint-initaws.d/` that installs Terraform and runs our Terraform definitions against `http://localhost:4566`. Then, the service that needs the AWS infrastructure has an entrypoint that polls `http://localstack:4566/health` and keeps looking for `{"features:initScripts":"initialized"}` in the response before attempting to actually start the service.

We found by trial and error that this was the most reliable way to bring up our stack, as opposed to looking for specific services to appear in the `/health` payload. However, now with this change we can't detect exactly when our Terraform provisioning finishes. It'd be great to get back that feature, or to have another way to detect when the LocalStack entrypoint has finished running the scripts in `/docker-entrypoint-initaws.d/`. For now we'll be sticking to `:0.12.19` instead of `:latest` as suggested.

Thank you.

### Anything else?

_No response_
return any([self.check(service_name) for service_name in self.list_available()])
    def get_state(self, name: str) -> Optional[ServiceState]:
        container = self.get_service_container(name)
        return container.state if container else None
    def get_states(self) -> Dict[str, ServiceState]:
        return {name: self.get_state(name) for name in self.list_available()}
    @log_duration()
    def require(self, name: str) -> Service:
        """
        High level function that always returns a running service, or raises an error. If the service is in a state
        that it could be transitioned into a running state, then invoking this function will attempt that transition,
        e.g., by starting the service if it is available.
        """
        container = self.get_service_container(name)
        if not container:
            raise ValueError("no such service %s" % name)
        if container.state == ServiceState.STARTING:
            if not poll_condition(lambda: container.state != ServiceState.STARTING, timeout=30):
                raise TimeoutError("gave up waiting for service %s to start" % name)
        with container.lock:
            if container.state == ServiceState.DISABLED:
                raise ServiceDisabled("service %s is disabled" % name)
            if container.state == ServiceState.RUNNING:
                return container.service
            if container.state == ServiceState.ERROR:
                
                raise container.errors[-1]
            if container.state == ServiceState.AVAILABLE: