wildfly-core-vault-test-galleon-pack is a wildfly-core-parent managed dependency, yet wildfly-core releases do not deploy it to remote Maven repositories. Any import, such as wildfly-parent or component matrix BOMs, of such dependency management than includes a non existent artifact...

There are two high level solutions for a fix:
a) deploy such artifact to remote maven repos
b) remove such artifact from WildFly-core-parent's dependency management

Please note that b) implies that either all dependants are updated to include <version/>, or such artifact version management is moved to testsuite/pom.xml (a non managed pom that is parent of all dependants).