🧪 [test: Add VectorField.min test coverage]

[shashi-manikonda]

🎯 What: Added tests for the VectorField.min method, filling a gap in the testing of basic statistical operations on vector fields.
📊 Coverage: The new test, test_vectorfield_min, covers finding the minimum magnitude on a typical numerical vector field. It also tests the calculation with sandalwood.mtf type vector arrays which handle min using the magnitude's constant component.
✨ Result: Increased test coverage for basic vector field operations ensuring regressions aren't inadvertently introduced to the min calculation logic.

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PR created automatically by Jules for task 4787812890931976425 started by @shashi-manikonda

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