Small bug: model_name instead of deployment_name in AzureOpenAIEmbeddingSkill object creation

When creating the `AzureOpenAIEmbeddingSkill` instance in [azure-search-integrated-vectorization-sample.ipynb](https://github.com/Azure/azure-search-vector-samples/blob/692e2e38d5c29af8790b8280298a1e1f433730d9/demo-python/code/azure-search-integrated-vectorization-sample.ipynb), the `model` variable containing `"text-embedding-ada-002"` model name is used as input for `deployment_id` field, instead of the actual name of the model deployment.

https://github.com/Azure/azure-search-vector-samples/blob/692e2e38d5c29af8790b8280298a1e1f433730d9/demo-python/code/azure-search-integrated-vectorization-sample.ipynb#L301

I think it should be changed to `deployment_id=os.getenv("AZURE_OPENAI_EMBEDDING_DEPLOYED_MODEL")`.

Open azure-search-integrated-vectorization-sample.ipynb and inspect the AzureOpenAIEmbeddingSkill creation at the linked line. Verify which environment variable contains the deployed model name, then update the deployment_id value so the notebook uses that deployment rather than the model string. Done means the sample passes the configured deployment name to Azure OpenAI.

Written by the indexing model from the issue text.