### 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_
container = super().get_service_container(name)
        if container:
            return container
        if not self.exists(name):
            return None
        
        
        plugin = self._load_service_plugin(name)
        if not plugin or not plugin.service:
            return None
        with self._mutex:
            if plugin.service not in self._services:
                super().add_service(plugin.service)
        return super().get_service_container(name)
    @property
    def api_provider_specs(self) -> Dict[str, List[str]]:
        """
        Returns all provider names within the service plugin namespace and parses their name according to the convention,
        that is "<api>:<provider>". The result is a dictionary that maps api => List[str (name of a provider)].
        """
        if self._api_provider_specs is not None:
            return self._api_provider_specs
        with self._mutex:
            if self._api_provider_specs is None:
                self._api_provider_specs = self._resolve_api_provider_specs()
            return self._api_provider_specs
    @log_duration()
    def _load_service_plugin(self, name: str) -> Optional[ServicePlugin]: