fix(openai): remove __future__.annotations import from test files (#33144)

Breaks schema conversion in places.

libs/partners/openai/pyproject.toml

@@ -85,6 +85,7 @@ ignore = [
     "RUF001",
     "ERA001",
     "PLR0911",
+    "FA100",  # from __future__ import annotations breaks some schema conversion logic
 
     # TODO
     "PLR2004", # Comparison to magic number

libs/partners/openai/tests/integration_tests/chat_models/test_base.py

@@ -1,7 +1,5 @@
 """Test ChatOpenAI chat model."""
 
-from __future__ import annotations
-
 import base64
 import json
 from collections.abc import AsyncIterator

libs/partners/openai/tests/integration_tests/chat_models/test_responses_api.py

@@ -1,7 +1,5 @@
 """Test Responses API usage."""
 
-from __future__ import annotations
-
 import json
 import os
 from typing import Annotated, Any, Literal, Optional, cast