[Refactor] Simplify control flow in relativizePath with early return

[gonzaloriestra]

What's being changed?

Refactored relativizePath in packages/cli-kit/src/public/node/path.ts to replace the if/else block with an early return clause, simplifying control flow and improving readability.

How to test your changes?

CI

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PR created automatically by Jules for task 17809010222742937239 started by @gonzaloriestra

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