RF-13199: mark all non-Warp test deployments as testable=false + added extension that verifies that
RF-13417: workaround for 'Could not inject members' exception on WildFly (ARQ-1598)
RF-13199: mark Placeholder framework tests as testable=false
RF-13199: do not pack RF-specific arquillian extensions when deployment is not testable

avoids extensive container warnings when CDI can't load dependent classes