[Compiler playground] bold changed passes (#29159)

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## Summary

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In the playground, it's hard to see at a glance what compiler passes are
involved in introducing changes.
This PR bolds every pass that introduces a change.

## How did you test this change?

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Before:
<img width="1728" alt="image"
src="https://github.com/facebook/react/assets/5144292/803ca786-0726-4456-b0db-520dc90a6771">

After:
<img width="1728" alt="image"
src="https://github.com/facebook/react/assets/5144292/38885644-00e9-4065-9c44-db533000d13a">