[2679] Add hourly model support to the NetCDF parser

[Matteo-Salis]

Description

We add support for hourly models to the NetCDF parser (netcdf_parser.py). We have been inspired by the quaver_parser.py that already supports hourly models.

The exporter functionality and command remain the same: uv run export --run-id <INFERENCE_ID> --stream ERA5 --output-dir ../output_nc --format netcdf --regrid-degree 1 --regrid-type regular_ll

For hourly models, the argument --fstep-hours (by default 6) must be set to 1

The code has been developed and tested on Santis using the inference muly9d4v of the hourly model af90zz71, and the inference h8ymb6sh of the 6h model atmofs03.

Issue Number

This fixes #2679

Checklist before asking for review

• I have performed a self-review of my code
• My changes comply with basic sanity checks:
  • I have fixed formatting issues with ./scripts/actions.sh lint
  • I have run unit tests with ./scripts/actions.sh unit-test
  • I have documented my code and I have updated the docstrings.
  • I have added unit tests, if relevant
• I have tried my changes with data and code:
  • I have run the integration tests with ./scripts/actions.sh integration-test
  • (bigger changes) I have run a full training and I have written in the comment the run_id(s): launch-slurm.py --time 60
  • (bigger changes and experiments) I have shared a hegdedoc in the github issue with all the configurations and runs for this experiments
• I have informed and aligned with people impacted by my change:
  • for config changes: the MatterMost channels and/or a design doc
  • for changes of dependencies: the MatterMost software development channel

[clessig]

@Matteo-Salis : thank you for the contribution.

@enssow : could you have a look at this?