Switch pytest traceback to native (#1389)

In cudf & cuml we have observed a ~10% to ~20% respectively speed up of pytest suite execution by switching pytest traceback to `--native`:

```
currently:

102474 passed, 2117 skipped, 902 xfailed in 892.16s (0:14:52)

--tb=short:

102474 passed, 2117 skipped, 902 xfailed in 898.99s (0:14:58)

--tb=no:

102474 passed, 2117 skipped, 902 xfailed in 815.98s (0:13:35)

--tb=native:

102474 passed, 2117 skipped, 902 xfailed in 820.92s (0:13:40)
```

This PR makes similar change to `dask-cuda` repo.

xref: rapidsai/cudf#16851

Authors:
  - GALI PREM SAGAR (https://github.com/galipremsagar)
  - Peter Andreas Entschev (https://github.com/pentschev)

Approvers:
  - Peter Andreas Entschev (https://github.com/pentschev)

URL: #1389

dask_cuda/tests/pytest.ini

@@ -0,0 +1,4 @@
+# Copyright (c) 2024, NVIDIA CORPORATION.
+
+[pytest]
+addopts = --tb=native