Development Eclipse EMF Parsley

Update to a new Eclipse release

Update the Oomph file org.eclipse.emf.parsley.oomph/EMFParsley.setup: add another target platform node, e.g., "2024-03" (copying the latest existing one), for the current Eclipse release, in "Modular Target" both for "RCP" and "RAP".
- In that new node for the target platform update the URL of the Eclipse releases and the Orbit update site (e.g., https://download.eclipse.org/tools/orbit/simrel/orbit-aggregation/2024-03).
- Change the default value of eclipse.target.platform to the new target platform
Run the Oomph workflow (when run from Eclipse already Oomphed, change the Target Plarform to the latest one).

Update the Oomph file org.eclipse.emf.parsley.oomph/EMFParsley.setup: replace the Xtext and MWE2 update sites in the corresponding properties (xtext.site andmwe2.site). Change the Xtext version range in "master / P2 Directory / Xtext Releases".
Update the Xtext version in /org.eclipse.emf.parsley.workspace/feature.xml.
Update the Xtext version in /org.eclipse.emf.parsley.dsl.feature/feature.xml.
Update the .target files: Both the simrel.target and simrel-rap.target in org.eclipse.emf.parsley.targetplatform with the URL of the Xtext and MWE2 update sites.
Update the properties for Xtext and MWE2 in the parent POM.
Run the Oomph workflow.