GEOPY-2714: Refactor extent property calculation for all grid objects

[domfournier]

GEOPY-2714 - Refactor extent property calculation for all grid objects

[Copilot]

Pull request overview

This PR updates extent/windowing utilities used when masking vertices/cells (notably for topography windowing against mesh bounds), removes the now-unused octree_extents helper, and aligns unit tests with the new extent representation.

Changes:

• Remove octree_extents utility and its associated test.
• Update mask_vertices_and_cells to rely on geoh5py.shared.utils.mask_by_extent and accept an extent array (as used by mesh.entity.extent).
• Update topography masking to pass mesh.entity.extent directly, and adjust tests accordingly.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
simpeg_drivers/utils/utils.py	Reworks extent masking implementation and removes octree_extents.
simpeg_drivers/components/topography.py	Switches topography windowing to use mesh.entity.extent directly.
tests/utils_test.py	Drops octree_extents test and updates extent shape in mask_vertices_and_cells tests.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.85%. Comparing base (898927a) to head (5a89022).
⚠️ Report is 5 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #369      +/-   ##
===========================================
- Coverage    89.86%   89.85%   -0.01%     
===========================================
  Files          125      125              
  Lines         6425     6419       -6     
  Branches       793      793              
===========================================
- Hits          5774     5768       -6     
  Misses         448      448              
  Partials       203      203              

Files with missing lines	Coverage Δ
simpeg_drivers/components/topography.py	93.54% <ø> (-0.11%)	⬇️
simpeg_drivers/utils/utils.py	70.07% <100.00%> (-0.52%)	⬇️

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