Replace the deprecated smooshpack with @codesandbox/sandpack-client

What does this MR do and why?

The MR upgrades the deprecated smoosjpack package with @codesandbox/sandpack-client as the next "incarnation" of a codesandbox' client.

Screenshots or screen recordings

No visible changes

How to set up and validate locally

• You need a local instance with LivePreview enabled for Web IDE
• If you don't have it yet, create a new simple project with just CSS/JS/HTML. For example, import some Vue todo app
• Make sure your project's package.json contains a main entry point pointing to correct file
• Open the project in Web IDE
• Open Live Preview
• The Live Preview should work

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.