[ty] Added support for "go to references" in ty playground. (#19516)
This PR adds support for "go to references" in the ty playground.
<img width="393" height="168" alt="image"
src="https://github.com/user-attachments/assets/ce3ae1bf-c17c-4510-9f77-20b10f6170c4"
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Co-authored-by: UnboundVariable <unbound@gmail.com>