Rename ertbox -> grid dimensions

[oyvindeide]

Issue
Resolves #my_issue

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 'just rapid-tests')

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: Add backport label to latest release (format: 'backport release-branch-name')

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.54%. Comparing base (b894195) to head (8fe82d0).
⚠️ Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12202      +/-   ##
==========================================
- Coverage   90.58%   90.54%   -0.04%     
==========================================
  Files         435      436       +1     
  Lines       29933    30007      +74     
==========================================
+ Hits        27114    27171      +57     
- Misses       2819     2836      +17     

Flag	Coverage Δ
cli-tests	37.37% <27.27%> (+0.02%)	⬆️
gui-tests	68.55% <30.30%> (-0.13%)	⬇️
performance-and-unit-tests	73.94% <93.93%> (+<0.01%)	⬆️
test	38.07% <9.09%> (-0.04%)	⬇️

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[xjules]

I guess this should be param_config.pop("ertbox_params", None)?

[xjules]

Just had a small comment in the migration but otherwise good.

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing oyvindeide:rename_ertbox (8fe82d0) with main (8c03d9e)}

Summary

✅ 22 untouched benchmarks

[oddvarlia]

A comment: I am not sure renaming ertbox to grid_dimensions is a good approach since this contains more than grid dimensions. The class ErtboxParameters contains not only grid dimensions, but equally important a definition of a local coordinate system used for calculating the transformation of observations positions into the local grid coordinate system.

[oddvarlia]

I am not sure we should rename this to grid_dimensions since the class ErtboxParameters not only contains grid dimensions (nx,ny,nz) but equally important a definition of the local coordinate system for the field parameters. grid_dimensions is not a very descriptive name of the class ErtboxParameters