[Refactor] Use early return and rename relativeComponents in relativizePath

[gonzaloriestra]

WHY are these changes introduced?

Improves code readability and maintainability of path utility functions within @shopify/cli-kit.

WHAT is this pull request doing?

Refactors relativizePath in packages/cli-kit/src/public/node/path.ts to use an early return instead of an imperative if/else block, and renames the variable relativeComponents to upLevels to reveal its intent more clearly.

How to test your changes?

CI

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

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PR created automatically by Jules for task 9727930294855882166 started by @gonzaloriestra

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