Add tenacity to e2e Azure batch CI and revert importorskip

PR #22785 used pytest.importorskip which causes exit code 5 (all
skipped) in CI. Instead, add tenacity to the CI workflow pip install
and restore direct imports.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/test-proxy-e2e-azure-batches.yml

@@ -56,7 +56,7 @@ jobs:
         run: |
           poetry config virtualenvs.in-project true
           poetry install --with dev,proxy-dev --extras "proxy"
-          poetry run pip install psycopg2-binary uvicorn fastapi httpx
+          poetry run pip install psycopg2-binary uvicorn fastapi httpx tenacity
 
       - name: Setup litellm-enterprise
         run: |

tests/proxy_e2e_azure_batches_tests/test_managed_files_base.py

@@ -12,8 +12,6 @@ import httpx
 import openai
 import psycopg2
 import pytest
-
-tenacity = pytest.importorskip("tenacity", reason="tenacity required for e2e batch tests")
 from tenacity import Retrying, stop_after_delay, wait_fixed
 
 sys.path.insert(0, os.path.abspath("../.."))

tests/proxy_e2e_azure_batches_tests/test_proxy_e2e_azure_batches.py

@@ -7,8 +7,6 @@ import warnings
 import httpx
 import openai
 import pytest
-
-tenacity = pytest.importorskip("tenacity", reason="tenacity required for e2e batch tests")
 from tenacity import RetryError
 
 sys.path.insert(0, os.path.abspath("../.."))