Moved dkrz-era5 data source in DKRZ default config to separate file

[schlunma]

Description

To avoid errors like Dataset key 'grib_id' must be specified when using the default DKRZ configuration with published recipes.

See #2995.

Docs: https://esmvaltool--2996.org.readthedocs.build/projects/ESMValCore/en/2996/quickstart/find_data.html#era5-in-grib-format-available-on-dkrz-s-levante-or-downloaded-from-the-cds

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.68%. Comparing base (974ff8c) to head (279bc5e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2996      +/-   ##
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- Coverage   95.69%   95.68%   -0.01%     
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  Files         267      267              
  Lines       15726    15726              
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- Hits        15049    15048       -1     
- Misses        677      678       +1     

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[bouweandela]

How about moving this configuration to a separate file, e.g. data-hpc-dkrz-era5-grib.yml instead of commenting it out?

One of the issues we had with the old configuration, which contained lots of commented out settings, was that it was unclear to new users which bits they needed to uncomment, resulting in syntax errors.

[schlunma]

Very good point, completely missed that we can do that now! 😅

Changed in 0b987dc.

[bouweandela]

Thanks! The docs will also need to be updated:

ESMValCore/doc/quickstart/find_data.rst

Lines 140 to 166 in 974ff8c

	ERA5 (in GRIB format available on DKRZ's Levante or downloaded from the CDS)
	^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
	ERA5 data in monthly, daily, and hourly resolution is `available on Levante
	<https://docs.dkrz.de/doc/dataservices/finding_and_accessing_data/era_data/index.html#era-data>`__
	in its native GRIB format.
	.. note::
	ERA5 data in its native GRIB format can also be downloaded from the
	`Copernicus Climate Data Store (CDS)
	<https://cds.climate.copernicus.eu/datasets>`__.
	For example, hourly data on pressure levels is available `here
	<https://cds.climate.copernicus.eu/datasets/reanalysis-era5-pressure-levels?tab=download>`__.
	Reading self-downloaded ERA5 data in GRIB format is experimental and likely
	requires additional setup from the user like setting up the proper directory
	structure for the input files.
	To read these data with ESMValCore, use the data definition for the ``native6``
	project:
	.. literalinclude:: ../configurations/data-hpc-dkrz.yml
	:language: yaml
	:caption: Contents of ``data-hpc-dkrz.yml``
	:start-at: # ERA5 data in GRIB format:
	:end-before: OBS6:
	To use this configuration, run ``esmvaltool config copy data-hpc-dkrz.yml``.

[schlunma]

Docs updated in 279bc5e