Enable strict mode toggle in storybook

[LFDanLu]

Closes

✅ 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 locally, toggle strict mode in storybook via the toolbar at the top. Check that stories with overlays break when strict mode is enabled

🧢 Your Project:

RSP

[LFDanLu]

Reopening due to provider breaking in stories upon save (components using useProvider will complain that scale isn't defined anymore). This issue seems to happen on main already but only intermittently, adding the strict mode decorator seems to make it happen a lot more though

[LFDanLu]

Note that saving changes in certain files (FocusScope) may cause the storybook to lag a bit, most likely due to some fast refresh shenanigans. At least it doesn't crash anymore though, final fix will be done in Parcel