Remove bunch of stuff from ensemble config

[valentin-krasontovitsch]

Please consider the commit messages for explanations of what's going on, and justifications for the removals.

I will / intend to fixup / squash many of the commits before merging, they are mostly left isolated to make the review process easier.

Pre review checklist

• [x] Added appropriate release note label
• [x] PR title captures the intent of the changes, and is fitting for release notes.
• [ ] Commit history is consistent and clean, in line with the contribution guidelines.

Adding labels helps the maintainers when writing release notes. This is the list of release note labels.

[codecov-commenter]

Codecov Report

Merging #4075 (a0fcd6e) into main (9d35798) will increase coverage by 0.15%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #4075      +/-   ##
==========================================
+ Coverage   57.70%   57.86%   +0.15%     
==========================================
  Files         510      510              
  Lines       38309    38135     -174     
  Branches     3433     3398      -35     
==========================================
- Hits        22107    22065      -42     
+ Misses      15327    15203     -124     
+ Partials      875      867       -8     

Impacted Files	Coverage Δ
src/clib/lib/enkf/config_keys.cpp	0.88% <ø> (+0.01%)	:arrow_up:
src/clib/lib/enkf/enkf_config_node.cpp	42.94% <0.00%> (-0.76%)	:arrow_down:
src/clib/lib/enkf/enkf_node.cpp	1.36% <ø> (+<0.01%)	:arrow_up:
src/clib/lib/enkf/gen_data.cpp	32.60% <ø> (+6.29%)	:arrow_up:
src/clib/lib/enkf/gen_data_config.cpp	60.89% <ø> (+11.61%)	:arrow_up:
...rc/ert/_c_wrappers/enkf/config/enkf_config_node.py	78.00% <ø> (ø)
src/ert/_c_wrappers/enkf/config/gen_data_config.py	82.14% <ø> (+0.98%)	:arrow_up:
src/ert/_c_wrappers/enkf/data/gen_data.py	67.56% <ø> (+0.06%)	:arrow_up:
src/ert/_c_wrappers/enkf/ensemble_config.py	91.33% <ø> (ø)
src/ert/_c_wrappers/enkf/enkf_fs_manager.py	86.44% <0.00%> (-5.87%)	:arrow_down:
... and 13 more

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[valentin-krasontovitsch]

if you should happen to review and want to merge during my absence, which i sincerely hope, feel free to squash all the commits, I think this can just be bundled up as remove unused code - maybe keep the bit i wrote about the export function only being used (according to both code and comment) for the field type, if you feel like it.

[sondreso]

Could the naming of this PR be updated to be a bit more informative for the release notes?

[valentin-krasontovitsch]

it is done!