Remove write_netcdf and write_plots from config-user.yml

[bouweandela]

Description

Remove write_netcdf and write_plots from config-user.yml. These settings have been deprecated for a year and are scheduled for removal in v2.4.

Related to #93

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[codecov]

Codecov Report

Merging #1300 (5c7bdbd) into main (d4667eb) will increase coverage by 0.21%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1300      +/-   ##
==========================================
+ Coverage   86.45%   86.66%   +0.21%     
==========================================
  Files         188      188              
  Lines        9193     9182      -11     
==========================================
+ Hits         7948     7958      +10     
+ Misses       1245     1224      -21     

Impacted Files	Coverage Δ
esmvalcore/_recipe.py	91.34% <ø> (-0.04%)	⬇️
esmvalcore/_task.py	62.32% <ø> (+0.43%)	⬆️
...mvalcore/experimental/config/_config_validators.py	91.73% <ø> (ø)
esmvalcore/_config/_config.py	94.11% <100.00%> (+5.40%)	⬆️
esmvalcore/experimental/config/_config_object.py	89.07% <0.00%> (+9.24%)	⬆️

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[bouweandela]

The issue reported by Codacy is best solved by integrating the esmvalcore.experimental.config module into the main tool, but that is out of scope for this pull request.

[schlunma]

Code looks good! I ran the test recipe successfully and also tested using an invalid configuration option, which gives an

esmvalcore.experimental.config._validated_config.InvalidConfigParameter: `write_plots` is not a valid config parameter.

now. Nice work 🎉