Fix types of useAnchoredPosition to avoid type assertions.

[T-Hugs]

Closes #4447

Changelog

New

Changed

useAnchoredPosition types updated to remove user type assertions

Removed

Rollout strategy

• [ ] Patch release
• [ ] Minor release
• [ ] Major release; if selected, include a written rollout or migration plan
• [ ] None; if selected, include a brief description as to why

Testing & Reviewing

Merge checklist

• [x] Added/updated tests
• [ ] Added/updated documentation
• [x] Added/updated previews (Storybook)
• [x] Changes are SSR compatible
• [ ] Tested in Chrome
• [ ] Tested in Firefox
• [ ] Tested in Safari
• [ ] Tested in Edge
• [ ] (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

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Latest commit: 3c5eebb13aaba180db745eddde10c9f9c5e59876

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