Fix k-truss test failure on Blackwell

[jnke2016]

The test_ktruss_subgraph_Graph test was failing on Blackwell (RTX PRO 6000) with nvcc 13.0 due to thrust::reduce_by_key silently corrupting its output when operating on zip_iterator<tuple<int32_t, int32_t>>. The bug is in nvcc 13.0 and is fixed in nvcc 13.2.

This PR:

• Applies a workaround in k_truss_impl.cuh replacing the buggy thrust::reduce_by_key call with thrust::unique_copy + thrust::lower_bound / thrust::upper_bound
• Re-enables the k-truss wheel tests that were previously skipped.

See #5494 for details. The original reduce_by_key call should be restored once nvcc 13.0 is no longer supported.