Fix packaging of CDS archives

Merge Request Required Information

Summary of Changes

• The JDK build includes CDS archives, classes.jsa and classes_nocoops.jsa already since JEP 341. Executing -Xshare:dump in the headless post script breaks AppCDS workflows using dynamic dumps since that relies on the base CDS archive from the JDK to be unchanged.

• Following JDK-8005165, class data sharing can be enabled on all JIT architectures

• Exclude classes_nocoops.jsa on i686 and arm32

• Introduce vm_variant global for consistency with future JDK builds

Approved Development Ticket

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• Resolves: rhbz#2203412