Do not raise when model version path is s3

Signed-off-by: Richard He <richard@graft.com>

Author: Richard He

mlflow_export_import/model/import_model.py

@@ -91,7 +91,7 @@ def _import_version(self,
         :param sleep_time: Seconds to wait for model version crreation.
         """
         dst_source = dst_source.replace("file://","") # OSS MLflow
-        if not dst_source.startswith("dbfs:") and not os.path.exists(dst_source):
+        if not dst_source.startswith("dbfs:") and not dst_source.startswith("s3:") and not os.path.exists(dst_source):
             raise MlflowExportImportException(f"'source' argument for MLflowClient.create_model_version does not exist: {dst_source}", http_status_code=404)
         kwargs = {"await_creation_for": self.await_creation_for } if self.await_creation_for else {}
         tags = src_vr["tags"]