show the docker image:tag on the task page of the Nomad GUI

### Proposal

In the Nomad GUI, it would be good to see the Docker `image:tag` for the task.
This would give an immediate answer to someone without the cmdline access to figure out which version of the service is running.

Also, for the other task drivers, it could show the equivalent relevant information, like `command` and `args` (for `raw_exec`), etc.

### Use-cases
Related to https://github.com/hashicorp/nomad/issues/11009 this becomes even more important as the job definition which can be seen in the GUI now has only a variable, and not the actual value stored anywhere.

### Attempted Solutions
I tried `nomad inspect`, but couldn't figure out any commands which showed the image:tag of the running Docker task.

Start at the Nomad GUI task page and trace how running task and driver details are displayed. Determine how Docker image:tag and equivalent raw_exec command and args are exposed, then verify the page shows the relevant runtime information for each supported driver.

Written by the indexing model from the issue text.