Fix focus tracking for dynamic iframe content

[ritz078]

Closes #5882

✅ 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:

🧢 Your Project:

[snowystinger]

GET_BUILD

[rspbot]

Build successful! 🎉

• View the storybook
• View the storybook-17
• View the storybook-16
• View the documentation

[rspbot]

## API Changes

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[snowystinger]

looks good, if you have some time, a unit test would be good too, to make sure we don't have regressions. the story is helpful, thanks for including that

reminder for anyone looking at this. first click into an iframe will result in focus visible, this is expected. click a second time and it'll go away

[snowystinger]

Thanks for getting the test started. It appears there was an issue with jsdom tab/focus. I found a way to work around it.