fix: correct assertion syntax and API usage in edge case tests

- Convert TUnit Assert.That().IsEqualTo() to MSTest Assert.AreEqual()
- Fix np.arange dtype parameter (use .astype() instead)
- Fix np.zeros/ones boolean syntax (use generic np.zeros<bool>)
- Fix np.full parameter order (fill_value, shape)
- Fix scalar dtype checks in ArgMax/ArgMin tests

Author: Nucs