fix: replace traversal packages with empathic

[43081j]

Just the same we've done in primitives - replacing various "upwards traversal" packages with just one.

This comes with a perf improvement too (CPU time).

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[mrstork]

Related to https://github.com/netlify/primitives/pull/387

[43081j]

any chance i can get some help to get this over the line? 👀

would be good to avoid it going stale again