Align custom lwp table with CMIP6 version

[schlunma]

Description

This PR aligns our custom lwp table with the CMIP6 version.

See #2789 (review).

Backwards-incompatible change #

This PR also changes standard name of lwp in our custom table from "" to "atmosphere_mass_content_of_cloud_liquid_water", which will be a problem with downstream code that depends on the standard_name entry. I won't expect any problems with this to be honest.

There is no way to restore the old behavior. Downstream code needs to be adapted.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.45%. Comparing base (976cfec) to head (6352870).
⚠️ Report is 58 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2791   +/-   ##
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  Coverage   95.45%   95.45%           
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  Files         260      260           
  Lines       15496    15496           
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  Hits        14792    14792           
  Misses        704      704           

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[axel-lauer]

Looks good and solves a problem with multi_model_statistics that prevented using datasets that provide lwp directly and datasets that require derivation of lwp.

[schlunma]

@ESMValGroup/esmvaltool-coreteam This introduces a (small) backwards-incompatible change. However, I don't expect any problems with this.

Please object if you have any concerns about this.

This will be merged in 2 weeks.

[valeriupredoi]

all good by me, putting a temporary blocker to allow for the two weeks and avoid eager merges; I put "Merge PR 2791" in me agenda, so I won't forget 😁

[valeriupredoi]

this will be merged this week, Friday 15th 🍺 @ESMValGroup/esmvaltool-coreteam please see #2791 (comment) and comment here as per your one and a half pennies (British two cents 😁 )

[valeriupredoi]

time's up! I'm merging this 🚚