remove its.gal.sdk from studio

Removes the SDK version of ITS tool and keep only some minimal feature

This avoids a recent issue in the build:

[ERROR]   Missing requirement: fr.lip6.move.gal.feature.pnml.feature.group 1.0.0.202206201219 requires 'org.eclipse.equinox.p2.iu; org.apache.ws.commons.axiom.axiom-api 1.3.0' but it could not be found

This also decrease a little the studio size (568MB instead of 587MB)