Explicitly add com.google.guava:failureaccess as test scope dependency required by Ocsp Test cases

In WFCORE-5979 we are moving com.google.guava:guava and com.google.guava:failureaccess as a pure test dependency for WildFly Core. This affect how WildFly consumes in the testsuite/elytron module since these dependencies are no longer going to be picked up from wildfly-core management dependency.

As WFCORE-5979 shows, after removing them we are getting failures on the Ocsp Test cases. The task here is to add `com.google.guava:failureaccess` as a test dependency and avoid these issues due to the fragile way in how maven picks up the transitive dependencies