fix: update selected_output field to handle which outputs is displayed first (#8538)

* fix: update selected_output field in various starter project JSON files

- Added or adjusted the "selected_output" field in multiple starter project JSON files to ensure consistency and correct functionality.
- Refactored the output selection logic in the GenericNode component to utilize the updated "selected_output" property.

Co-authored-by: Gabriel Luiz Freitas Almeida <gabriel@langflow.org>

* fix: enhance output handling in GenericNode and NodeOutputField components

- Added a check to prevent auto-unhiding outputs with group_outputs set to false in NodeOutputField.
- Updated the GenericNode component to ensure the selected_output field is correctly assigned during node updates.
- Introduced group_outputs property in the OutputFieldType to support new output handling logic.

Co-authored-by: Gabriel Luiz Freitas Almeida <gabriel@langflow.org>

* Revert starter_projects directory to main branch state

* 📝 (general-bugs-shard-3909.spec.ts): update test description to match the changed button text for better clarity and maintainability

---------

Co-authored-by: Gabriel Luiz Freitas Almeida <gabriel@langflow.org>
Co-authored-by: cristhianzl <cristhian.lousa@gmail.com>

src/frontend/tests/extended/regression/general-bugs-shard-3909.spec.ts

@@ -44,7 +44,7 @@ test(
     await expect(page.getByTestId("button_run_chat output")).toBeVisible({
       timeout: 30000,
     });
-    await expect(page.getByTestId("button_run_openai")).toBeVisible({
+    await expect(page.getByTestId("button_run_language model")).toBeVisible({
       timeout: 30000,
     });
     await expect(page.getByTestId("button_run_prompt")).toBeVisible({