test: update backend config, frontend utilities, and test coverage (#8671)

* ✨ (custom-get-download-folders.ts): update default filename to include folderName variable to provide more context and improve user experience

* ✨ (custom-get-download-folders.ts): update folder name from "My Projects" to "Starter Project" for better clarity and consistency

* 📝 (.github/changes-filter.yaml): add new directory 'serialization' to components list for changes filtering
🐛 (general-bugs-truncate-results.spec.ts): fix typo in 'truncated' word and update timeout for better test reliability

* 🔧 (custom-get-download-folders.ts): Remove unnecessary conditional statement and update default filename for download to "flows.zip" for better clarity.