GEOPY-2686: Improve topography augmentation for DC and MT

[domfournier]

GEOPY-2686 - Improve topography augmentation for DC and MT

[Copilot]

Pull request overview

This PR updates active-cell expansion behavior for surface-constrained inversions and refreshes expected run-test targets affected by the numerical change.

Changes:

• Includes current electrodes when locating containing cells for 2D tensor meshes.
• Reworks forced-to-surface active-cell expansion using a KD-tree proximity search.
• Updates expected inversion metrics in DC/IP/MT and joint cross-gradient run tests.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
simpeg_drivers/utils/utils.py	Uses both potential and current electrode locations for tensor mesh containing-cell lookup.
simpeg_drivers/components/topography.py	Changes topography active-cell reference and neighbor expansion logic.
tests/run_tests/driver_dc_test.py	Updates 3D DC target metrics.
tests/run_tests/driver_dc_2d_test.py	Updates 2D DC target metrics.
tests/run_tests/driver_ip_test.py	Updates 3D IP target metrics.
tests/run_tests/driver_ip_2d_test.py	Updates 2D IP target metrics.
tests/run_tests/driver_mt_test.py	Updates MT target metrics.
tests/run_tests/driver_joint_cross_gradient_test.py	Updates expected misfit scaling and multipliers.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.31%. Comparing base (23097b7) to head (c70ac17).

Additional details and impacted files

@@                Coverage Diff                 @@
##           release/GA_4.8     #408      +/-   ##
==================================================
- Coverage           90.42%   90.31%   -0.12%     
==================================================
  Files                 110      110              
  Lines                6527     6525       -2     
  Branches              826      824       -2     
==================================================
- Hits                 5902     5893       -9     
- Misses                413      421       +8     
+ Partials              212      211       -1     

Files with missing lines	Coverage Δ
simpeg_drivers/components/topography.py	96.49% <100.00%> (+2.94%)	⬆️
simpeg_drivers/utils/utils.py	65.15% <100.00%> (-2.13%)	⬇️

... and 1 file with indirect coverage changes

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