### Is there an existing issue for this?

- [X] I have searched the existing issues

### Feature description

The use case I have in mind is to run Node 16.x Lambdas - the default container registry is `lambci/lambda` which is effectively abandoned. [Not even Node 14.x has been published](https://github.com/lambci/docker-lambda/pull/330). However, switching the registry over to [`amazon/aws-lambda-nodejs`](https://hub.docker.com/r/amazon/aws-lambda-nodejs) still fails to pull the container, since localstack is looking for the tag `nodejs16.x`. I'd like to be able to specify that if the runtime is `nodejs16.x` it just looks for tag `16`.

### 🧑‍💻 Implementation

_No response_

### Anything else?

_No response_
idx = last_index_of(
                lines, lambda line: line and not line.startswith(INTERNAL_LOG_PREFIX)
            )
            if idx >= 0:
                result = lines[idx]
                additional_logs = "\n".join(lines[:idx] + lines[idx + 1 :])
                log_output += "\n%s" % additional_logs
        func_arn = lambda_function and lambda_function.arn()
        output = OutputLog(result, log_output)
        LOG.debug(
            f"Lambda {func_arn} result / log output:"
            f"\n{output.stdout_formatted()}"
            f"\n>{output.stderr_formatted()}"
        )
        
        store_lambda_logs(lambda_function, log_output)
        if error:
            output.output_file()
            raise InvocationException(
                "Lambda process returned with error. Result: %s. Output:\n%s"
                % (result, log_output),
                log_output,
                result,
            ) from error
        
        invocation_result = InvocationResult(result, log_output=log_output)
        
        invocation_result = self.process_result_via_plugins(inv_context, invocation_result)
        return invocation_result
    def prepare_event(self, environment: Dict, event_body: str) -> bytes: