Enable OpenVINO export of loaded model

[echarlaix]

from diffusers import StableDiffusionPipeline
from optimum.intel import OVStableDiffusionPipeline
from optimum.exporters.openvino import export_from_model

model_id = "runwayml/stable-diffusion-v1-5"
model = StableDiffusionPipeline.from_pretrained(model_id)

save_dir = "ov_model"
export_from_model(model, output=save_dir, task="stable-diffusion")
pipeline = OVStableDiffusionPipeline.from_pretrained(save_dir)
images = pipeline("sailing ship in storm by Rembrandt").images

[HuggingFaceDocBuilderDev]

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[echarlaix]

get the following error from nncf when left uncommented :
No match has been found among the model operations for the following ignored/target scope definitions