Fix Loading SSR'd apps via gr.load

[freddyaboulton]

Description

The current logic for fetching the config in gr.load fails if the app is SSR'd as window.gradio_config is not in the page. So made some modifications to fetch from the /config route if it exists and fallback to window.gradio_config if it fails.

Test with gr.load("gradio/calculator", src="spaces")

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Tests

1. PRs will only be merged if tests pass on CI. To run the tests locally, please set up your Gradio environment locally and run the tests: bash scripts/run_all_tests.sh

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[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Website	ready!	Website preview
🦄	Changes	detecting...

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Install Gradio from this PR

pip install https://gradio-pypi-previews.s3.amazonaws.com/15274b9c0989b1fea492103dd4e7cd3e09b415d4/gradio-5.3.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@15274b9c0989b1fea492103dd4e7cd3e09b415d4#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-npm-previews.s3.amazonaws.com/15274b9c0989b1fea492103dd4e7cd3e09b415d4/gradio-client-1.7.0.tgz

Use Lite from this PR

<script type="module" src="https://gradio-lite-previews.s3.amazonaws.com/15274b9c0989b1fea492103dd4e7cd3e09b415d4/dist/lite.js""></script>

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
gradio	patch

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With the following changelog entry.

Fix Loading SSR'd apps via gr.load

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