refactor(typescript): add TypeScript types to SearchSkeleton

[davesteinberg]

Closes #12554

Convert SearchSkeleton to TypeScript.

Changelog

Changed

• Search.Skeleton.js converted to tsx, types defined

Testing / Reviewing

• Add a SearchSkeleton element to bottom of Search.Skeleton.tsx and confirm no type errors. Add a prop with an invalid value and confirm the error is reported.

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