fix: "Start Here" button not working as expected + fe tests (#3910)

* ✅ (general-bugs-shard-3909.spec.ts): add test case to ensure user can create a new flow by clicking on "Start Here" button

* ✨ (componentsComponent/index.tsx): Add NewFlowModal component to allow users to create a new flow
📝 (componentsComponent/index.tsx): Update ComponentsComponent to handle opening and closing of NewFlowModal

* ✨ (emptyComponent/index.tsx): refactor EmptyComponent to use useIsFetching hook from @tanstack/react-query for loading state and pass handleOpenModal as a prop to improve code readability and maintainability

* ✨ (componentsComponent/index.tsx): refactor handleOpenModal function to improve code readability and maintainability