fix(calendar): support RangeCalendar selection inside shadow DOM

[jsmitrah]

Closes #10330

✅ 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:

• Go to the range calendar picker and click a date to set the start of the range, then click a second date to set the end in the Shadow DOM.
• Verify: The calendar should wait for the second click to commit the full multi-day range, rather than incorrectly committing start==end immediately on the first click.

🧢 Your Project:

[snowystinger]

Dupe of #10347
Any reason why you opened this one instead of commenting on the open PR?

[jsmitrah]

@snowystinger When I saw this issue, there was no PR created, and it looked like a simple fix. So I worked on it and created a PR. Only afterward did I realize that someone had already created a PR.