Derive vtkGLTFTexture from vtkObject

Ryan Krattigerrequested to merge
ryan.krattiger1/vtk:vtkGLTFTexture_vtkStandardNewMacro into master

Change the base class of vtkGLTFTexture to vtkObject to allow usage of vtkStandardNewMacro which requires the class to be derived from vtkObject when VTK_ALL_NEW_OBJECT_FACTORY is enabled.

Related to report here: https://github.com/RobotLocomotion/drake/pull/21387

Edited by Ryan Krattiger

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