FEM: Start examples rework (#15786)

* FEM: Delete data/examples/FemCalculixCantilever1D.FCStd

* FEM: Delete data/examples/FemCalculixCantilever2D.FCStd

* FEM: Delete data/examples/FemCalculixCantilever3D.FCStd

* FEM: add new example combining the previous 3

* FEM: Update CMakeLists.txt

* FEM: Update femmesh2mesh.py

* FEM: Update test_information.md

* FEM: Update test_result.py

* FEM: Update MaterialEditor.py

* FEM: Delete data/examples/FEMExample.FCStd

* FEM: add new example without logo

data/examples/CMakeLists.txt

@@ -6,9 +6,7 @@ SET(Examples_Files
     PartDesignExample.FCStd
     RobotExample.FCStd
     BIMExample.FCStd
-    FemCalculixCantilever1D.FCStd
-    FemCalculixCantilever2D.FCStd
-    FemCalculixCantilever3D.FCStd
+    FEMExample.FCStd
     AssemblyExample.FCStd
 )