CI Should produce release src packages

In addition to src packages the CI already produces it should produce also those src packages that are released.

Now packaging needs to:

• extract each src package
• run syncqt.pl
• re-compress the src package
• create the needed formats:
  • zip
  • tar.xz

This is a waste of resources and issues in sync.profile are not caught by the CI.

This should be enabled for products other than qt5. For qt5 src packages we are injecting licheck enablers which are not needed as such in qt6 anymore.

To avoid creating release src packages for integrations that are not to be released (including snapshots) some kind of top-level configuration file is needed. Maybe in .yaml files?