[ML] fixing inference reference counting tests

[benwtrent]

The reference count is eventually consistent as actions are taken to account for needlessly removing the model's bytes from the circuit breaker.

See:

elasticsearch/x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/inference/loadingservice/ModelLoadingService.java

Lines 392 to 401 in 836e4f9

	loadedModel.acquire();
	localModelCache.put(modelId, new ModelAndConsumer(loadedModel, consumer));
	shouldNotAudit.remove(modelId);
	} // synchronized (loadingListeners)
	for (ActionListener<LocalModel> listener = listeners.poll(); listener != null; listener = listeners.poll()) {
	loadedModel.acquire();
	listener.onResponse(loadedModel);
	}
	// account for the acquire in the synchronized block above
	loadedModel.release();

closes #59445

[elasticmachine]

Pinging @elastic/ml-core (:ml)

[davidkyle]

I just pushed a mute in dea030f that is probably your conflict sorry

[davidkyle]

LGTM

Thanks