chore: simplify authorized sqlstore (#3496)

# What does this PR do?

This PR is generated with AI and reviewed by me.

Refactors the AuthorizedSqlStore class to store the access policy as an
instance variable rather than passing it as a parameter to each method
call. This simplifies the API.

# Test Plan

existing tests

llama_stack/providers/remote/files/s3/files.py

@@ -137,7 +137,7 @@ class S3FilesImpl(Files):
         where: dict[str, str | dict] = {"id": file_id}
         if not return_expired:
             where["expires_at"] = {">": self._now()}
-        if not (row := await self.sql_store.fetch_one("openai_files", policy=self.policy, where=where)):
+        if not (row := await self.sql_store.fetch_one("openai_files", where=where)):
             raise ResourceNotFoundError(file_id, "File", "files.list()")
         return row
 
@@ -164,7 +164,7 @@ class S3FilesImpl(Files):
         self._client = _create_s3_client(self._config)
         await _create_bucket_if_not_exists(self._client, self._config)
 
-        self._sql_store = AuthorizedSqlStore(sqlstore_impl(self._config.metadata_store))
+        self._sql_store = AuthorizedSqlStore(sqlstore_impl(self._config.metadata_store), self.policy)
         await self._sql_store.create_table(
             "openai_files",
             {
@@ -268,7 +268,6 @@ class S3FilesImpl(Files):
 
         paginated_result = await self.sql_store.fetch_all(
             table="openai_files",
-            policy=self.policy,
             where=where_conditions,
             order_by=[("created_at", order.value)],
             cursor=("id", after) if after else None,