Fix two failing unit tests w.r.t. MVS utilities

Two tests are failing currently: `TestEllipsoidUtils.test_get_right_singular_vectors` and `TestPatchmatchNetData.test_select_src_views`.

The first is due to the fact that we aren't returning singular values, so we need to correct the terminology. The other test looks like it is flaky due to some random ordering of the output.
```
> assert np.allclose(singular_values, S)
E AssertionError: assert False
E + where False = (array([7.73928148, 2.82711821, 1.20177289]), array([13.40482874, 4.89671238, 2.08153171]))
```

Start by running TestEllipsoidUtils.test_get_right_singular_vectors and TestPatchmatchNetData.test_select_src_views. Inspect the MVS utilities used by those tests to verify the singular-value terminology and investigate the random output ordering. Done means both named unit tests pass reliably.

Written by the indexing model from the issue text.