[Refactor] Use Set for alreadyPresentKeys in patchEnvFile

[gonzaloriestra]

WHY are these changes introduced?

In patchEnvFile, key existence tracking previously used alreadyPresentKeys: string[], performing array linear scans with .includes() for every variable patched in .env.

WHAT is this pull request doing?

Refactored alreadyPresentKeys in patchEnvFile (packages/cli-kit/src/public/node/dot-env.ts) to use a Set<string>, replacing .push() with .add() and .includes() with .has(). This simplifies membership lookups while preserving exact behavior.

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 10551597752176063295 started by @gonzaloriestra

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