test: fix flaky logout test race condition

[yogeshchoudhary147]

Summary

Fixes intermittent test failure in should provide a logout method by waiting for authentication to complete before calling logout.

Changes

Added isAuthenticated check to the existing waitFor block to ensure the provider has finished initializing before testing logout behavior.

await waitFor(() => {
  expect(result.current.logout).toBeInstanceOf(Function);
  expect(result.current.isAuthenticated).toBe(true);
});