Handle missing dependencies for optional TestExecutionListener again

Commit d1b65f6 introduced a regression regarding the handling of
missing dependencies for optional (typically default)
TestExecutionListeners.

Prior to d1b65f6 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

spring-test/src/main/java/org/springframework/test/context/support/AbstractTestContextBootstrapper.java

@@ -16,6 +16,7 @@
 
 package org.springframework.test.context.support;
 
+import java.lang.reflect.InvocationTargetException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -200,7 +201,9 @@ public final List<TestExecutionListener> getTestExecutionListeners() {
 	 * @see SpringFactoriesLoader#load(Class, FailureHandler)
 	 */
 	protected List<TestExecutionListener> getDefaultTestExecutionListeners() {
-		FailureHandler failureHandler = (factoryType, factoryImplementationName, ex) -> {
+		FailureHandler failureHandler = (factoryType, factoryImplementationName, failure) -> {
+			Throwable ex = (failure instanceof InvocationTargetException ite ?
+					ite.getTargetException() : failure);
 			if (ex instanceof LinkageError || ex instanceof ClassNotFoundException) {
 				if (logger.isDebugEnabled()) {
 					logger.debug("Could not load default TestExecutionListener [" + factoryImplementationName +