🧹 [Code Health] Extract duplicated path generation code to test utils

[edithatogo]

🎯 What: Extracted duplicated code for generating unique catalog paths (for JSON and SQLite) from catalog_sync.rs and sqlite_catalog.rs into a shared unique_temp_path function in a new test_utils module. Also downgraded rusqlite slightly to bypass a build error with unstable cfg_select.
💡 Why: Reduces boilerplate, increases consistency across test files, and improves maintainability by centralizing common test logic.
✅ Verification: Ran cargo test and ensured all tests passed.
✨ Result: A cleaner codebase with fewer redundant lines and a central place for future test utilities.

---

PR created automatically by Jules for task 4546006837484919495 started by @edithatogo

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.

[cursor]

Bugbot is not enabled for your account, so this pull request was not reviewed.

Enable Bugbot in the Cursor dashboard to get automatic reviews on future PRs.