Remaining SSR todos

[abidlabs]

• [x] Update Spaces Dockerfile to include Node and run Gradio apps in SSR mode by default
• [x] Add e2e tests in SSR mode
• [ ] The title parameter of ChatInterface and Interface is not centered in SSR mode
• [ ] https://github.com/gradio-app/gradio/issues/9288
• [x] Ensure custom components work
• [x] Ensure gradio dev mode works
• [ ] Ensure that auth and other kwargs in gr.mount_gradio_app work with SSR
• [x] Ensure that head and css parameters work with SSR
• [ ] Ensure that scale is taken into account on the node server: e.g. notice how this loads https://huggingface.co/spaces/gradio-templates/text-to-image-gradio-template
• [ ] Issue related to interaction between SSR and the iframe resizer (see internal link)
• [ ] Some elements (like tabs) take a long time to hydrate, see this Space

[franz101]

what am I missing here for sir to work? https://colab.research.google.com/drive/1RlRZk1mcs6atrKwKErVrK0gqaTHSfTBl?usp=sharing