Remove LSF cluster interface

[timtroendle]

What happened?

The LSF cluster interface has been broken in #330. In fact, we want to drop LSF support and should remove all traces of LSF.

Version

1.2.0.dev

Relevant log output

No response

[timtroendle]

@calliope-project/euro-calliope-devs , I fixed this but in fact I cannot test it as LSF has been switched off at ETH in favour of Slurm. Do people require LSF? Otherwise, this can be seen as a non-issue and we could remove the LSF capabilities.

Either way, we should implement #244 to allow for cluster execution on Slurm.

[irm-codebase]

DelftBlue also uses SLURM for scheduling jobs. So on our end it should be perfectly OK to drop the feature.

[timtroendle]

Thanks for letting me know. I'll rename the issue accordingly.

[brynpickering]

Cambridge HPC also uses SLURM, so removing LSF support is fine by me