[WFLY-10028] Move XML validation test to dist
[WFLY-10028] Move XML validation test to dist

Use target/xml-validation to copy the XML/XSD files

Prepending with the name of the distribution breaks scripts that zip
e.g. dist/wildfly-*

JIRA: https://issues.jboss.org/browse/WFLY-10028

wildfly/wildfly,iweiss/wildfly,jstourac/wildfly,wildfly/wildfly,wildfly/wildfly,rhusar/wildfly,rhusar/wildfly,pferraro/wildfly,rhusar/wildfly,xasx/wildfly,wildfly/wildfly,golovnin/wildfly,tadamski/wildfly,rhusar/wildfly,iweiss/wildfly,jstourac/wildfly,xasx/wildfly,pferraro/wildfly,jstourac/wildfly,iweiss/wildfly,tadamski/wildfly,golovnin/wildfly,xasx/wildfly,pferraro/wildfly,pferraro/wildfly,tadamski/wildfly,iweiss/wildfly,jstourac/wildfly,golovnin/wildfly