Use nested exceptions in get_powershell_command (#2058)

autogen/code_utils.py

@@ -230,17 +230,15 @@ def get_powershell_command():
             raise FileNotFoundError(
                 "Neither powershell.exe nor pwsh.exe is present in the system. "
                 "Please install PowerShell and try again. "
-                f"Original error: {e}"
-            )
+            ) from e
         except NotADirectoryError as e:
             raise NotADirectoryError(
                 "PowerShell is either not installed or its path is not given "
                 "properly in the environment variable PATH. Please check the "
                 "path and try again. "
-                f"Original error: {e}"
-            )
+            ) from e
     except PermissionError as e:
-        raise PermissionError(f"No permission to run powershell. Original error: {e}")
+        raise PermissionError("No permission to run powershell.") from e
 
 
 def _cmd(lang):