Split the PVOutput user flow init from its data (#180652)

tests/components/pvoutput/test_config_flow.py

@@ -104,9 +104,15 @@ async def test_connection_error(hass: HomeAssistant, mock_pvoutput: MagicMock) -
     mock_pvoutput.system.side_effect = PVOutputConnectionError
 
     result = await hass.config_entries.flow.async_init(
-        DOMAIN,
-        context={"source": SOURCE_USER},
-        data={
+        DOMAIN, context={"source": SOURCE_USER}
+    )
+
+    assert result.get("type") is FlowResultType.FORM
+    assert result.get("step_id") == "user"
+
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        user_input={
             CONF_SYSTEM_ID: 12345,
             CONF_API_KEY: "tadaaa",
         },