Add line numbers when validating everest config files

[frode-aarstad]

Issue
Resolves #9527

Approach
Short description of the approach

(Screenshot of new behavior in GUI if applicable)

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'pytest tests/ert/unit_tests -n logical -m "not integration_test"')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Create Backport PR to latest release

[codspeed-hq]

CodSpeed Performance Report

Merging #9580 will improve performances by 10.64%

_{Comparing frode-aarstad:line-col-nr-during-validation (88025b6) with main (01156bb)}

Summary

⚡ 1 improvements
✅ 21 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	frode-aarstad:line-col-nr-during-validation	Change
⚡	test_direct_dark_performance_with_storage[gen_x: 20, sum_x: 20 reals: 10-gen_data_with_obs-get_record_observations]	2.6 ms	2.3 ms	+10.64%

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.82609% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.85%. Comparing base (0e19012) to head (88025b6).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/everest/config/everest_config.py	97.61%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9580      +/-   ##
==========================================
- Coverage   91.87%   91.85%   -0.02%     
==========================================
  Files         433      433              
  Lines       26770    26793      +23     
==========================================
+ Hits        24595    24612      +17     
- Misses       2175     2181       +6     

Flag	Coverage Δ
cli-tests	39.75% <ø> (-0.01%)	⬇️
everest-models-test	34.61% <82.60%> (-0.05%)	⬇️
gui-tests	72.12% <ø> (-0.02%)	⬇️
integration-test	38.62% <82.60%> (+1.42%)	⬆️
performance-tests	51.94% <ø> (+<0.01%)	⬆️
test	39.83% <97.82%> (-0.62%)	⬇️
unit-tests	74.12% <28.26%> (-0.05%)	⬇️

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[verveerpj]

Nice! One question out of curiosity.