[Tests] Add unit tests for constants.ts

[gonzaloriestra]

WHY are these changes introduced?

The file packages/cli-kit/src/public/node/constants.ts lacked a dedicated unit test file.

WHAT is this pull request doing?

This pull request introduces the packages/cli-kit/src/public/node/constants.test.ts file containing unit tests for STORE_AUTH_APP_CLIENT_ID.

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 13612006307128668260 started by @gonzaloriestra

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