[Refactor] Simplify normalizeDelimitedString

[gonzaloriestra]

WHY are these changes introduced?

The current implementation of normalizeDelimitedString is imperative and uses several intermediate variables. It also manually implements deduplication instead of using the existing uniq utility helper.

WHAT is this pull request doing?

Refactors normalizeDelimitedString in packages/cli-kit/src/public/common/string.ts to use a declarative chaining approach and the uniq utility from common/array.ts.

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 14687650256661895799 started by @gonzaloriestra

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