Fix mypy errors in storage directory (#7692)

Co-authored-by: openhands <openhands@all-hands.dev>

openhands/storage/conversation/conversation_validator.py

@@ -6,11 +6,11 @@ from openhands.utils.import_utils import get_impl
 class ConversationValidator:
     """Storage for conversation metadata. May or may not support multiple users depending on the environment."""
 
-    async def validate(self, conversation_id: str, cookies_str: str):
+    async def validate(self, conversation_id: str, cookies_str: str) -> tuple[None, None]:
         return None, None
 
 
-def create_conversation_validator():
+def create_conversation_validator() -> ConversationValidator:
     conversation_validator_cls = os.environ.get(
         'OPENHANDS_CONVERSATION_VALIDATOR_CLS',
         'openhands.storage.conversation.conversation_validator.ConversationValidator',

openhands/storage/google_cloud.py

@@ -1,10 +1,10 @@
 import os
 
 from google.api_core.exceptions import NotFound
-from google.cloud import storage  # type: ignore
-from google.cloud.storage.blob import Blob  # type: ignore
-from google.cloud.storage.bucket import Bucket  # type: ignore
-from google.cloud.storage.client import Client  # type: ignore
+from google.cloud import storage
+from google.cloud.storage.blob import Blob
+from google.cloud.storage.bucket import Bucket
+from google.cloud.storage.client import Client
 
 from openhands.storage.files import FileStore
 

openhands/storage/s3.py

@@ -60,7 +60,7 @@ class S3FileStore(FileStore):
             response: GetObjectOutputDict = self.client.get_object(
                 Bucket=self.bucket, Key=path
             )
-            with response['Body'] as stream:  # type: ignore
+            with response['Body'] as stream:
                 return str(stream.read().decode('utf-8'))
         except botocore.exceptions.ClientError as e:
             # Catch all S3-related errors