fix: resolve CI test failures for S3 and Redis services

- Skip S3 artifact tests when aioboto3 is not installed (optional dep)
  using pytest.importorskip at module level
- Defensively filter temp: prefixed keys in RedisSessionService.append_event
  to ensure temp state is never persisted to Redis, regardless of base
  class behavior

Author: miyannishar

src/google/adk_community/sessions/redis_session_service.py

@@ -197,6 +197,13 @@ async def append_event(self, session: Session, event: Event) -> Event:
         await super().append_event(session=session, event=event)
         session.last_update_time = event.timestamp
 
+        # Defensively strip temp state so it is never persisted to Redis.
+        temp_keys = [
+            k for k in session.state if k.startswith(State.TEMP_PREFIX)
+        ]
+        for k in temp_keys:
+            del session.state[k]
+
         async with self.cache.pipeline(transaction=False) as pipe:
             user_sessions_key = RedisKeys.user_sessions(
                 session.app_name, session.user_id

tests/unittests/artifacts/test_s3_artifact_service.py

@@ -16,6 +16,11 @@
 
 """Tests for S3ArtifactService."""
 
+import pytest
+
+# Skip the entire module if aioboto3 is not installed (optional dependency).
+pytest.importorskip("aioboto3", reason="aioboto3 is required for S3 tests")
+
 import asyncio
 from datetime import datetime
 from datetime import timezone
@@ -26,7 +31,6 @@
 from google.adk.artifacts.base_artifact_service import ArtifactVersion
 from google.adk_community.artifacts import S3ArtifactService
 from google.genai import types
-import pytest