[BUG] Rare batched PDLP CI bug

In CI the Python test "test_parser_and_batch_solver" sometimes fails with
```
a pure virtual method called
terminate called without an active exception
Fatal Python error: Aborted
```

As seen here: https://github.com/NVIDIA/cuopt/actions/runs/16266809031/job/45925573387?pr=201