[Refactor] output utility logic

[gonzaloriestra]

WHY are these changes introduced?

Refactor the output utility logic to use more idiomatic and robust modern JavaScript patterns.

WHAT is this pull request doing?

• Refactored outputContent in packages/cli-kit/src/public/node/output.ts to use a declarative .reduce() approach and .join('') for array tokens.
• Refactored formatSection in the same file to use .padEnd(35) for idiomatic string padding.

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 10740671485648585031 started by @gonzaloriestra

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[alexanderMontague]

The refactor preserves token rendering behavior, and the padEnd change makes section formatting more robust for long titles.

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