Use remote repositories API to enable create static web app in vscode.dev

[nturinski]

Remote Repositories lets users open GitHub repos in vscode.dev or in a virtual workspace. By leveraging their API, I was able to basically enable full SWA create support on vscode.dev with minimal refactoring.

There are a lot of files related to the git API, but I will move them in another PR since it would make reviewing changes a pain.

path.join won't work in vscode.dev, so I replaced it where relevant. createHttpFunction still uses it since it can only be used on desktop, though we can probably just remove it all eventually.

[nturinski]

Note: Still to do

• When there is no open folder in vscode.dev, the prompt still asks to open an existing projecting, which leads to your local directory. It should lead to a remote repo.
• There is a Git Clone button that doesn't work
• If you have a local folder opened in vscode.dev, it will fail with the error Cannot read properties of undefined (reading 'openRepository')