Fix sic units of HadREM3-GA7-05 with driver ICHEC-EC-EARTH

[bouweandela]

Description

Correct the units of sic from model HadREM3-GA7-05, the NetCDF attribute says the units are in %, but from the values it seems more likely that the units are a fraction.

Follow up to #3135

To test that this works as expected, run this code and observe that the maximum is almost 100%, as expected for data in percent, instead of almost 1%.

In [1]: from esmvalcore.dataset import Dataset

In [2]: Dataset(
   ...:   project="CORDEX",
   ...:   institute="MOHC",
   ...:   dataset="HadREM3-GA7-05",
   ...:   rcm_version="v1",
   ...:   driver="ICHEC-EC-EARTH",
   ...:   domain="EUR-11",
   ...:   mip="day",
   ...:   exp="historical",
   ...:   ensemble="r12i1p1",
   ...:   short_name="sic",
   ...: ).load().lazy_data().max().compute()
Out[2]: np.float32(99.909836)

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[valeriupredoi]

thanks, buds 🍺

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.39%. Comparing base (f337e40) to head (e30e0c5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3177   +/-   ##
=======================================
  Coverage   96.39%   96.39%           
=======================================
  Files         280      280           
  Lines       16246    16248    +2     
=======================================
+ Hits        15661    15663    +2     
  Misses        585      585           

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[bouweandela]

Thanks for reviewing!