[vscode-extension] Added support for reopen in devbox for cursor and vscodium

[mohsenari]

Summary

Title plus, removed remote-ssh dependency to allow publishing the extension in open-vsx marketplace.

Addresses #1619

I've been wanting to get this fixed for a while but with recent traction on vscode alternatives it makes sense to finally get this fix in.

How was it tested?

steps:

1. compile devbox binary (devbox run build)
2. update line 56 in vscode-extension/src/devbox.ts to the absolute path to compiled devbox binary
3. have all 3 of cursor, vscodium and vscode installed
4. have vsce installed globally (npm install -g vsce)
5. in devbox/vscode-extension folder run: vsce package && code --install-extension devbox-0.1.6.vsix && cursor --install-extension devbox-0.1.6.vsix && codium --install-extension devbox-0.1.6.vsix
6. quit any already open code editor, open it to refresh the editor with new installed extension
7. cmd + shift + p and type devbox: reopen in devbox and hit enter in vscode, cursor, and vscodium