[Feature]: Create workspaces from cloned URLs in the background

### Problem or use case

When creating a new workspace from cloned URLs, you get stuck with the interface blocked until the repository gets cloned. It would be better if you were able to continue using the ADE while the repo is cloned and the workspace is created.

### Proposed solution

When you create a workspace by cloning a repo, it should download in the background without blocking the rest of the interface, for better user experience.

### Alternatives or additional context

I'd be happy to spin up GPT 5.6 Sol to try to come up with an implementation to solve this