[Fix] CI: fix helm not found and MCP tests on Python 3.9

1. check_code_and_doc_quality: install helm before running helm lint
   (Docker image cimg/python:3.11 doesn't include helm)
2. proxy_store_model_in_db_tests: skip MCP tests on Python < 3.10
   since MCP module isn't available and functions inside the
   `if MCP_AVAILABLE:` block don't exist as module-level attributes

.circleci/config.yml

@@ -1645,6 +1645,10 @@ jobs:
       - run: uv run --no-sync python ./tests/code_coverage_tests/ban_copy_deepcopy_kwargs.py
       - run: uv run --no-sync python ./tests/code_coverage_tests/check_fastuuid_usage.py
       - run: uv run --no-sync python ./tests/code_coverage_tests/memory_test.py
+      - run:
+          name: Install Helm
+          command: |
+            curl https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 | bash
       - run: helm lint ./deploy/charts/litellm-helm
 
   db_migration_disable_update_check:

tests/store_model_in_db_tests/test_mcp_servers.py

@@ -1,3 +1,4 @@
+import sys
 from datetime import datetime
 from typing import List, Optional
 import pytest
@@ -8,6 +9,14 @@ from unittest import mock
 from fastapi.testclient import TestClient
 from fastapi import FastAPI
 
+# MCP requires Python >= 3.10.  Tests that mock functions defined inside the
+# ``if MCP_AVAILABLE`` block cannot run on older interpreters because those
+# module-level names simply don't exist.
+_SKIP_NO_MCP = pytest.mark.skipif(
+    sys.version_info < (3, 10),
+    reason="MCP requires Python >= 3.10",
+)
+
 from starlette import status
 
 from litellm.constants import LITELLM_PROXY_ADMIN_NAME
@@ -109,6 +118,7 @@ def test_does_mcp_server_exist():
     assert False == does_mcp_server_exist(mcp_server_records, not_found_record)
 
 
+@_SKIP_NO_MCP
 @pytest.mark.asyncio
 async def test_create_mcp_server_direct():
     """
@@ -198,6 +208,7 @@ async def test_create_mcp_server_direct():
         mock_manager.add_server.assert_called_once_with(expected_response)
 
 
+@_SKIP_NO_MCP
 @pytest.mark.asyncio
 async def test_create_duplicate_mcp_server():
     """
@@ -258,6 +269,7 @@ async def test_create_duplicate_mcp_server():
         assert "already exists" in str(exc_info.value.detail)
 
 
+@_SKIP_NO_MCP
 @pytest.mark.asyncio
 async def test_create_mcp_server_auth_failure():
     """
@@ -302,6 +314,7 @@ async def test_create_mcp_server_auth_failure():
         assert "permission" in str(exc_info.value.detail)
 
 
+@_SKIP_NO_MCP
 @pytest.mark.asyncio
 async def test_create_mcp_server_invalid_alias():
     """
@@ -356,6 +369,7 @@ async def test_create_mcp_server_invalid_alias():
         )
 
 
+@_SKIP_NO_MCP
 @pytest.mark.asyncio
 async def test_edit_mcp_server_redacts_credentials():
     with mock.patch(