[Tests] Remove filesystem mocks in result.test.ts

[gonzaloriestra]

WHY are these changes introduced?

Follow the instructions from .agents/automated-tasks/tests.md to remove filesystem mocks.

WHAT is this pull request doing?

Refactor packages/store/src/cli/services/store/execute/result.test.ts to replace vi.mock('@shopify/cli-kit/node/fs') with real filesystem operations using inTemporaryDirectory and readFile.

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 3233301235182325625 started by @gonzaloriestra

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