[Tests] Replace filesystem mocks in store execute result tests

[gonzaloriestra]

WHY are these changes introduced?

This PR refactors the unit tests for writeOrOutputStoreExecuteResult to replace filesystem mocks with real filesystem operations using temporary directories. This aligns with the repository's testing best practices of testing real behavior and avoiding mocks of core utilities like @shopify/cli-kit/node/fs.

WHAT is this pull request doing?

• Removed vi.mock('@shopify/cli-kit/node/fs') from packages/store/src/cli/services/store/execute/result.test.ts.
• Updated tests that write to files to use inTemporaryDirectory and joinPath.
• Replaced assertions on writeFile calls with actual file content verification using 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 10145309229126400021 started by @gonzaloriestra

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