GEOPY-753: Add Gravity surveys as option with runtest

[domfournier]

GEOPY-753 - Add Gravity surveys as option with runtest

[Copilot]

Copilot review overview

🟢 Approval recommended

The focused factory change is consistently integrated and covered by the updated gravity run test.

Review effort: Balanced
Findings: None

What changed in this PR

Adds native AirborneGravity survey creation for gravity synthetic workflows and validates it in the gravity run test.

Changes:

• Creates AirborneGravity objects for gravity methods.
• Updates gravity test filenames and verifies the survey type.

File	Description
simpeg_drivers/​utils/​synthetics/​surveys/​factory.py	Adds gravity-specific survey creation.
tests/​run_tests/​driver_grav_test.py	Validates the survey type and updates output paths.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.48%. Comparing base (f3d1d01) to head (2a1216d).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #484   +/-   ##
========================================
  Coverage    90.48%   90.48%           
========================================
  Files          111      111           
  Lines         7105     7108    +3     
  Branches       880      881    +1     
========================================
+ Hits          6429     6432    +3     
  Misses         456      456           
  Partials       220      220           

Files with missing lines	Coverage Δ
simpeg_drivers/utils/synthetics/surveys/factory.py	100.00% <100.00%> (ø)

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