chore: replace tsc with tsgo

[reidbarber]

https://devblogs.microsoft.com/typescript/progress-on-typescript-7-december-2025/

On my machine:

tsc: 57.6s
tsgo: 10.8s

To get VSCode to use it, you'll need to go to Settings -> TypeScript -> Experimental: Use Tsgo.

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

Test yarn lint.

🧢 Your Project:

[rspbot]

Build successful! 🎉

• View the storybook
• View the S2 storybook
• View the S2 docs
• View the React Aria docs

[snowystinger]

dang that is so fast! it took 8s on my machine

[snowystinger]

are we keeping both around just for timing comparison? or can we remove the old typescript?

[reidbarber]

I thought it might be nice to keep both in case we get a weird error in tsgo and want to go compare with tsc to make sure it isn't due to a difference between the two.

[rspbot]

Build successful! 🎉

• View the storybook
• View the S2 storybook
• View the S2 docs
• View the React Aria docs