sync remote disk after copying workspace

Author: yuxuan-ms

doc/newsfragments/3577_changed.remote.rst

@@ -0,0 +1 @@
+Sync remote disk after copying workspace on Remote host.

testplan/common/remote/remote_resource.py

@@ -507,6 +507,10 @@ def _prepare_workspace(self, exist_on_remote: bool) -> None:
                 remote_target=True,
                 exclude=self.cfg.workspace_exclude,
             )
+            self._ssh_client.exec_command(
+                cmd="/usr/bin/sync",
+                label="sync remote disk after copying workspace",
+            )
 
             if IS_WIN:
                 return