feat: rewrite collab server connecting (#4881)

Co-authored-by: dwelle <luzar.david@gmail.com>

src/tests/collab.test.tsx

@@ -15,6 +15,14 @@ Object.defineProperty(window, "crypto", {
   },
 });
 
+jest.mock("../excalidraw-app/data/index.ts", () => ({
+  __esmodule: true,
+  ...jest.requireActual("../excalidraw-app/data/index.ts"),
+  getCollabServer: jest.fn(() => ({
+    url: /* doesn't really matter */ "http://localhost:3002",
+  })),
+}));
+
 jest.mock("../excalidraw-app/data/firebase.ts", () => {
   const loadFromFirebase = async () => null;
   const saveToFirebase = () => {};