UI: Display GPU resource usage

### Proposal

According to #9917 it seems as though Nomad is already aware of certain resource usage information from GPUs, so I think that a simple solution would be to query for this data and display it using the existing graph components.

### Use-cases

As it stands, it is impossible to tell if a job is using GPU resources without SSH-ing into the machine and running a tool such as `nvidia-smi`. Even then, tools like `nvidia-smi` do not directly tell you which job is using the resources, only the process. It would be nice if the status page for the job itself could let you know of the GPU resource usage which, in turn, could help in visualizing when those resources get completely consumed (at least until a solution for #9917 becomes available).

### Attempted Solutions

None of the resource metrics available in the UI expose the GPUs at all. The closest I've seen to knowing that GPUs are available at all is the docker driver info on the client status page. Even then, that only shows that the nvidia runtime is available.


Start at the job status page and the existing graph components, then trace how current resource metrics are queried and how Docker driver information exposes GPU availability. Done means the UI shows GPU resource usage for the relevant job and makes consumption visible without requiring SSH or nvidia-smi.

Written by the indexing model from the issue text.