refactor(forwarder): remove unnecessary backward-compatible Storage alias

The alias is no longer needed since all production code now uses the
factory method and base class pattern.

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

Author: LorisFriedel

aws/logs_monitoring/retry/storage.py

@@ -86,7 +86,3 @@ def _serialize(self, data):
 
     def _deserialize(self, data):
         return json.loads(data.decode("UTF-8"))
-
-
-# Backward-compatible alias
-Storage = S3Storage

aws/logs_monitoring/tests/test_s3_storage.py

@@ -4,7 +4,7 @@
 
 from botocore.exceptions import ClientError
 
-from retry.storage import S3Storage, Storage
+from retry.storage import S3Storage
 
 
 class TestS3Storage(unittest.TestCase):
@@ -15,9 +15,6 @@ def setUp(self):
             with patch("retry.storage.DD_S3_BUCKET_NAME", "test-bucket"):
                 self.storage = S3Storage("test_function_prefix")
 
-    def test_backward_compatible_alias(self):
-        self.assertIs(Storage, S3Storage)
-
     def test_store_data_puts_object(self):
         self.storage.store_data("logs", [{"message": "hello"}])
         self.mock_s3.put_object.assert_called_once()