Add QuadtoSOC test with permutation

[blegat]

The QuadtoSOC bridge has been added in #483 using sparse cholesky.
For the sparse cholesky of A, we have A = P' * L * L' * P. The implementation takes into account the permutation but in the tests, the permutation matrix is always the identity so we wouldn't catch if we were using P' were it should be P for instance.