feat: create tests, more integration testing, fix ID tests, use UUID (almost) everywhere

ref: N25B-412

test/pages/visProgPage/visualProgrammingUI/components/DragDropSidebar.test.tsx

@@ -95,7 +95,11 @@ describe("Drag & drop node creation", () => {
     const node = nodes[0];
 
     expect(node.type).toBe("phase");
-    expect(node.id).toBe("phase-1");
+
+    // UUID Expression
+    expect(node.id).toMatch(
+    /^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i
+    );
 
     // screenToFlowPosition was mocked to subtract 100
     expect(node.position).toEqual({