Fix Ollama pull failure propagation and Azure OpenAI vector store readiness

- Ollama CI: fail the step immediately if model pull fails after 3
  retries instead of silently proceeding to tests
- Azure OpenAI file search: add the same vector-store readiness polling
  that was applied to the non-Azure OpenAI tests, preventing eventual
  consistency race conditions

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

python/packages/openai/tests/openai/test_openai_chat_client_azure.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import asyncio
 import os
 from functools import wraps
 from pathlib import Path
@@ -77,6 +78,15 @@ async def create_vector_store(client: OpenAIChatClient) -> tuple[str, Content]:
     if result.last_error is not None:
         raise RuntimeError(f"Vector store file processing failed with status: {result.last_error.message}")
 
+    # Wait for the vector store index to be fully searchable.
+    # create_and_poll confirms file processing, but the search index is eventually consistent.
+    for _ in range(10):
+        vs = await client.client.vector_stores.retrieve(vector_store.id)
+        if vs.file_counts.completed >= 1 and vs.file_counts.in_progress == 0:
+            break
+        await asyncio.sleep(1)
+    await asyncio.sleep(2)
+
     return file.id, Content.from_hosted_vector_store(vector_store_id=vector_store.id)