[CI] Migrate GPU workers to use openrm.

todos:
- https://github.com/dmlc/xgboost/pull/10932
- Add tests with HMM disabled to avoid accessing host memory by accidient.
https://docs.nvidia.com/cuda/cuda-toolkit-release-notes/index.html#cuda
Disable HMM for UVM

+ Create or edit /etc/modprobe.d/uvm.conf.
+ Add or update the following line:
```
options nvidia_uvm uvm_disable_hmm=1
```
+ Unload and reload the nvidia_uvm kernel module or reboot the system:
``` sh
sudo modprobe -r nvidia_uvm
sudo modprobe nvidia_uvm
```