ifsbench rework launching mechanism

[johannesbulin]

Is your feature request related to a problem? Please describe.

At the moment, essentially he classes

• Job
• Arch
• Launcher

are responsible for launching executables. As these are pure classes, they can't easily be customised but most be subclassed. They also don't interact nicely with the new datapipeline approach.

Describe the solution you'd like

• Arch and Launcher classes are overhauled. They become abstract base classes and simple subclasses are implemented to support the most basic needs.
• System specific solutions are removed (no LUMI arch files for example).
• Similar to the data pipeline approach, an environment pipeline should be created.

Describe alternatives you've considered

No response

Additional context

No response

Organisation

ECMWF