[Refactor] Use early returns in sniffForPath

[gonzaloriestra]

WHY are these changes introduced?

This is a clean refactoring of sniffForPath to replace nested if statements with flat early returns and guard clauses, improving the code readability and maintainability of path utility functions.

WHAT is this pull request doing?

Refactors sniffForPath in packages/cli-kit/src/public/node/path.ts to use early returns/guard clauses rather than checking the negative condition (pathFlagIndex === -1) to handle the --path= fallback.

How to test your changes?

CI

Post-release steps

N/A

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 15343219626415874416 started by @gonzaloriestra

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