Duplicate EMF extension parser for .cifx/.tooldefx

When launching the product, I see:

!ENTRY org.eclipse.emf.ecore 2 0 2024-01-02 17:21:24.162
!MESSAGE Both 'org.eclipse.escet.cif.io' and 'org.eclipse.escet.cif.metamodel' register an extension parser for 'cifx'

!ENTRY org.eclipse.emf.ecore 2 0 2024-01-02 17:21:24.164
!MESSAGE Both 'org.eclipse.escet.tooldef.io' and 'org.eclipse.escet.tooldef.metamodel' register an extension parser for 'tooldefx'

This works correctly, but is not so nice. Let's remove the duplicates.