fix(showcase/ms-agent-python): beautiful-chat Task Manager — drop networkidle wait

The MAF spec had an extra `await page.waitForLoadState("networkidle")`
that LGP's identical test doesn't have. MAF's CopilotKit chat keeps a
persistent SSE connection open after initial load, so the page never
reaches network-idle — the wait always timed out at 120s before the
actual click→todos flow could run. Removed the spurious line so the
spec matches LGP exactly; the test now passes in ~5s instead of failing
on a precondition that can never be satisfied.

Author: AlemTuzlak

showcase/integrations/ms-agent-python/tests/e2e/beautiful-chat.spec.ts

@@ -227,7 +227,6 @@ test.describe("Beautiful Chat", () => {
     page,
   }) => {
     test.setTimeout(120_000);
-    await page.waitForLoadState("networkidle");
 
     await page
       .getByRole("button", { name: "Task Manager (Shared State)" })