fix(vite): set different cache dirs for client/server

[danielroe]

🔗 Linked issue

#20273

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

A custom plugin we wrote to achieve this same task was silently rendered ineffective (owing to @ts-ignore, which I quietly hate) in a previous vite upgrade. We can now use the top-level cacheDir to achieve the same result. Though I'm not aware of any issues at the moment, this should prevent sharing optimised dependencies between server + client.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codesandbox]

  Open in CodeSandbox Web Editor | VS Code | VS Code Insiders