Collect config errors before displaying

[eivindjahren]

Issue
Towards #5099

Approach
Short description of the approach

Pre review checklist

• Added appropriate release note label
• 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.
• Updated documentation
• Ensured new behaviour is tested

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

[codecov-commenter]

Codecov Report

Merging #5235 (db27f5b) into main (dcad416) will increase coverage by 0.01%.
The diff coverage is 88.49%.

❗ Current head db27f5b differs from pull request most recent head 49cce9f. Consider uploading reports for the commit 49cce9f to get more accurate results

@@            Coverage Diff             @@
##             main    #5235      +/-   ##
==========================================
+ Coverage   73.18%   73.19%   +0.01%     
==========================================
  Files         391      391              
  Lines       26875    26946      +71     
  Branches     1965     1965              
==========================================
+ Hits        19668    19723      +55     
- Misses       6643     6659      +16     
  Partials      564      564              

Impacted Files	Coverage Δ
src/ert/__main__.py	78.92% <0.00%> (ø)
src/ert/_c_wrappers/config/config_parser.py	94.52% <ø> (ø)
src/ert/_c_wrappers/enkf/ert_config.py	95.60% <85.00%> (-2.60%)	⬇️
src/ert/_c_wrappers/enkf/enkf_obs.py	87.37% <100.00%> (-0.13%)	⬇️
src/ert/_c_wrappers/job_queue/ext_job.py	99.41% <100.00%> (+0.56%)	⬆️
src/ert/gui/main.py	90.90% <100.00%> (-0.91%)	⬇️
src/ert/parsing/config_errors.py	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[yngve-sk]

LGTM👍