Add missing asserts to test_grid_manager.py

[msimberg]

https://hackmd.io/cuEsccnkTniYTn0ABCa7LQ?both#H9-Missing-assert-in-grid-connectivity-test

[github-actions]

Mandatory Tests

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• cscs-ci run default
• cscs-ci run distributed

Optional Tests

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[msimberg]

cscs-ci run default

[msimberg]

cscs-ci run distributed

[Copilot]

Pull request overview

This PR fixes a unit test that previously computed np.allclose(...) results without asserting them, ensuring the E2C2E/E2C2EO connectivity checks actually fail when mismatched.

Changes:

• Add missing assert statements around np.allclose(...) in test_grid_manager_eval_e2c2e.
• Ensures the sliced connectivity comparison (from start_index onward) is enforced by pytest.

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