Replace dependency to org.eclipse.osgi.services

[HannesWell]

The bundle o.e.osgi.services is deprecated for removal as part of eclipse-equinox/equinox#18 and already has been changed to be empty and only re-export the 'official' OSGi artifacts published to Maven-Central.
It should be replaced by imports of the desired org.osgi.service.* packages so that the runtime can choose a suitable provider independently of the bundle name.

In case of Acceleo it should mainly be removed from the acceleo.equinox.launcher feature. You could probably rely on dependencies being pulled in transitively.

[HannesWell]

@Kellindil could you please have a look at this? It should be relatively simple to resolve.

[Kellindil]

Hello @HannesWell ,

Sorry I was in holidays until today.

Unfortunately, I don't have an easy mean to test this modification. We plan on moving on from Acceleo 3 (that still depends on osgi.services) to a new implementation in the future so hopefully this won't be completely deprecated until then so we can avoid this change.

[HannesWell]

Understand. Thanks for the clarification.
The removal is scheduled to happen for the 2026-03 SimRel.
It would be great if you would have removed the usage of that bundle until then, in whichever way. :)