Fix exists handling

Signed-off-by: Xuanwo <[email protected]>

src/storage/drivers/opendal_adapter.rs

@@ -131,8 +131,14 @@ impl StoreDriver for OpendalAdapter {
     ///
     /// Returns a `StorageResult` with a boolean indicating the existence of the
     /// content.
+    ///
+    /// # TODO
+    ///
+    /// The `exists` function should return an error for issues such as permission denied.
+    /// However, these errors are not handled during the migration process and should be addressed
+    /// after the test suites are refactored.
     async fn exists(&self, path: &Path) -> StorageResult<bool> {
         let path = path.display().to_string();
-        Ok(self.opendal_impl.exists(&path).await?)
+        Ok(self.opendal_impl.exists(&path).await.is_ok())
     }
 }