Improve URL handling in JS Client (#8258)
* amend endpoint logic
* add changeset
* improve url joining for local URLs
* handle relative paths
* use join_urls in /info to ensure correct endpoints
* add relative url logic and throw error for node
* tweaks
* remove relative paths support (wont work)
* tweak
* tweak func to throw error and amend tests
* tweak
* accomodate . in space names
* replace error with const msg
* tweak tests with error var
* revert map() to reduce() due to misinterpreted base URL
---------
Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
Co-authored-by: Abubakar Abid <abubakar@huggingface.co>
