Update obs4MIPs names to ESGF's in Schlund20esd recipe

[rbeucher]

Description

Following discussion here #2974

CERES-EBAF Ed2-7 is not available on ESGF anymore.
CERES-EBAF Ed2-8 is available for variable rlut, rlutcs, rsdt, rsut, rsutcs.
This PR removes the version facet for CERES-EBAF which fix automatic download from ESGF.

AIRS RetStd-v5 ['hus'] >> AIRS-2-1
AIRS-2-0 v2 ['hur'] >> AIRS-2-0
CERES-EBAF Ed2-7 >> CERES-EBAF
GPCP-SG v2.2 ['pr'] >> GPCP-V2.2

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[bouweandela]

Thanks for taking the time to contribute! It looks like there is a small typo in the GPCP-V2.2 dataset name. It should be spelled with uppercase 'V'.

[rbeucher]

Thanks for pointing this out!

[bouweandela]

Thanks for the updates! Could you please merge the main branch from this GitHub git repository into your branch? That should solve the failing tests. For example, if you have added this repository under the name upstream, you can do this by running the command git pull upstream main.

Comments have been addressed.