Improve location info in error message

[eivindjahren]

Issue
Resolves #5815

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.

[andreas-el]

Approved 🚀

[codecov-commenter]

Codecov Report

Merging #5832 (0265e38) into main (3ca1eb1) will decrease coverage by 4.33%.
The diff coverage is 71.87%.

@@            Coverage Diff             @@
##             main    #5832      +/-   ##
==========================================
- Coverage   85.92%   81.59%   -4.33%     
==========================================
  Files         328      347      +19     
  Lines       19383    21787    +2404     
  Branches        0      715     +715     
==========================================
+ Hits        16654    17778    +1124     
- Misses       2729     3756    +1027     
- Partials        0      253     +253     

Files Changed	Coverage Δ
src/ert/config/ert_config.py	94.32% <ø> (ø)
src/ert/config/lint_file.py	30.00% <30.00%> (ø)
src/ert/config/parsing/error_info.py	97.01% <88.23%> (-2.99%)	⬇️
src/ert/__main__.py	81.00% <100.00%> (+1.46%)	⬆️
src/ert/config/__init__.py	100.00% <100.00%> (ø)
src/ert/config/parsing/config_errors.py	100.00% <100.00%> (ø)

... and 18 files with indirect coverage changes

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