Commit d1b65f6d3e introduced a regression regarding the handling of
missing dependencies for optional (typically default)
TestExecutionListeners.
Prior to d1b65f6d3e a TestExecutionListener was instantiated using
java.lang.Class.newInstance() which never throws an
InvocationTargetException. With the switch to the new
SpringFactoriesLoader APIs, a TestExecutionListener is now instantiated
using java.lang.reflect.Constructor.newInstance(Object...) which can
throw an InvocationTargetException.
This commit addresses the regression by unwrapping the target exception
in an InvocationTargetException.
See gh-28666
Closes gh-28828
f5503298fb