[bugfix] Pass explicitly the --cpus-per-task option to srun for Slurm >= 22.05

[ekouts]

For Slurm version >= 22.05 we pass explicitly --cpus-per-task to srun if num_cpus_per_task is set. For older versions we simply emit the srun command. If we cannot get the version of Slurm we also pass the option since it shouldn't hurt in theory for older versions.

Fixes #2655 .

[vkarak]

You have the job so you can set the --cpus-per-task based on the job's value, from job.num_cpus_per_task. If it's None, you simply don't add the option. Also, I would also suggest to check the srun --version during the initialization of the launcher and emit this option only if it is greater than 22.05.

[ekouts]

You have the job so you can set the --cpus-per-task based on the job's value, from job.num_cpus_per_task. If it's None, you simply don't add the option.

I thought about this but I think it wouldn't work if the user is setting the option from the cli with -Jcpus-per-task, right? Or if it's part of the partition options in the configuration. I will try it to make sure