[Tests] Add command-level unit tests for app info command

[gonzaloriestra]

WHY are these changes introduced?

The app info command was previously lacking command-level unit tests despite having service-level coverage. Adding these tests increases test coverage and reduces regression risks during refactorings.

WHAT is this pull request doing?

This pull request implements comprehensive command-level unit tests for packages/app/src/cli/commands/app/info.ts covering:

• Parsing flags and preparing context correctly.
• Rendering layout when custom sections are returned.
• Rendering JSON output via outputResult when --json flag is supplied.
• Rendering text string output via outputResult when info service returns a string.
• Handling of app loading errors by calling process.exit(2).

How to test your changes?

shopify app info

Post-release steps

None.

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 12118509797862963742 started by @gonzaloriestra

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