refactor: use join instead of path.join

[james-elicx]

Context
We're inconsistent with how we use default imports with node:path vs every other import in the codebase.

Changes

• Pulls the path normalization out into a utility.
• Replaces the path default import with importing the actual stuff that's used.

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Latest commit: 5e7edde

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commit: 5e7edde

[vicb]

Thanks!