moved all submit env var checking to submit function

Author: mooperd

tests/test_steps_silicon.py

@@ -269,8 +269,7 @@ def test_run_cli_submit_missing_api_keys(self, mock_load_dotenv, mock_prepare):
             step.run_cli(args)
 
         # Verify error message
-        self.assertIn("CHIPFLOW_API_KEY_ID", str(cm.exception))
-        self.assertIn("CHIPFLOW_API_KEY_SECRET", str(cm.exception))
+        self.assertIn("CHIPFLOW_API_KEY", str(cm.exception))
         # Verify dotenv was loaded
         mock_load_dotenv.assert_called_once()