Bring back "cleanup duplicated code gen ai sdk (Azure#34048)" (Azure#34319)

* Reapply "cleanup duplicated code gen ai sdk (Azure#34048)" (Azure#34224)

This reverts commit 537647b.

* remove unused files in tasks

* add ignore word llm

* ignore llms

Author: jingyizhu99

sdk/ai/azure-ai-generative/azure/ai/generative/index/_build_mlindex.py

@@ -38,8 +38,8 @@ def build_index(
         from azure.ai.generative.index._documents import DocumentChunksIterator, split_documents
         from azure.ai.generative.index._embeddings import EmbeddingsContainer
         from azure.ai.generative.index._tasks.update_acs import create_index_from_raw_embeddings
-        from azure.ai.generative.index._utils.connections import get_connection_by_id_v2
         from azure.ai.generative.index._utils.logging import disable_mlflow
+        from azure.ai.resources._index._utils.connections import get_connection_by_id_v2
     except ImportError as e:
         print("In order to use build_index to build an Index locally, you must have azure-ai-generative[index] installed")
         raise e
@@ -176,7 +176,7 @@ def _create_mlindex_from_existing_acs(
 ) -> Index:
     try:
         from azure.ai.generative.index._embeddings import EmbeddingsContainer
-        from azure.ai.generative.index._utils.connections import get_connection_by_id_v2
+        from azure.ai.resources._index._utils.connections import get_connection_by_id_v2
     except ImportError as e:
         print("In order to use build_index to build an Index locally, you must have azure-ai-generative[index] installed")
         raise e