vtkmSlice now works with uniform grid

This path was previously disabled because there was a bug in VTK-m's flying
edges implementation that caused crashes. The issue has since been resolved.

Addresses: #18856

Accelerators/Vtkm/Filters/vtkmSlice.cxx

@@ -58,9 +58,7 @@ bool vtkmSlice::CanProcessInput(vtkDataSet* input)
   auto imageData = vtkImageData::SafeDownCast(input);
   if (imageData && imageData->GetDataDimension() == 3)
   {
-    // Currently, vtkm's flying edges implementation crashes for some cases.
-    // Temporarily disabling this code path
-    return false;
+    return true;
   }
 
   auto rectilinearGrid = vtkRectilinearGrid::SafeDownCast(input);