chore: add .ts files to prettier config

[ericapisani]

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Summary

Fixes #<replace_with_issue_number>

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[github-actions]

📊 Benchmark results

Comparing with 5c61169

• Dependency count: 1,396 (no change)
• Package size: 404 MB (no change)
• Number of ts-expect-error directives: 0 (no change)

[khendrikse]

So clean!

[kodiakhq]

This PR currently has a merge conflict. Please resolve this and then re-add the automerge label.