Update obs4MIPs tables

[schlunma]

Description

I've been working with obs4MIPs data a lot recently, which can be quite frustrating because our tables are very outdated. This PR updates the tables to the most recent commit (note that the latest released version is also very old (>3.5 years)).

Couple of additional things I found:

• This also fixes the automatic retrieval of the institute facet for obs4MIPs data.
• As far as I can tell from Metagrid, it's also necessary to specify a grid for obs4MIPs datasets to fully describe them (it works without it because in 99% of cases the grid is gn, but technically we need it). We might consider updating our recipes accordingly.

Backwards-incompatible change #

Removal of tables

The following tables have been removed:

• obs4MIPs_monNobs.json (with single variable ndviNobs)
• obs4MIPs_monStderr.json: (with single variable ndviStderr)

Those cannot be used anymore.

Closes #1890

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.48%. Comparing base (6f03e55) to head (a9cc626).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3194      +/-   ##
==========================================
- Coverage   96.49%   96.48%   -0.01%     
==========================================
  Files         280      280              
  Lines       16282    16294      +12     
==========================================
+ Hits        15711    15722      +11     
- Misses        571      572       +1     

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[valeriupredoi]

this is mega, very many thanks, Manu! Ping me when you ready for a review 🍺

[schlunma]

This is ready now from my side.