Use root url for monitoring url

[abidlabs]

Closes: #8494

Ensures that the correct /monitoring URL is shown if running with root url or running on HF Spaces, etc.

Also ensures that non-logged in users can't hit /monitoring

[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Website	ready!	Website preview
🦄	Changes	detected!	Details

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Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/c804b720e023030e76405eef78f09ff390254ec9/gradio-4.36.1-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@c804b720e023030e76405eef78f09ff390254ec9#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-builds.s3.amazonaws.com/c804b720e023030e76405eef78f09ff390254ec9/gradio-client-1.1.1.tgz

[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.

Use root url for monitoring url

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[freddyaboulton]

Thanks @abidlabs - only comment is that I would write a unit test for this!

[abidlabs]

Yup will do, thanks @freddyaboulton!