Remove element from protectionDomains when resetting the class loader

When we reset the class loader with the new transformed classes, we need
to make sure we drop the element from the protectionDomains, otherwise
the MemoryClassPathElement is kept as a key and leaks to the next
test/dev mode runs.

Fixes quarkusio#51688

Author: gsmet

independent-projects/bootstrap/core/src/main/java/io/quarkus/bootstrap/classloading/QuarkusClassLoader.java

@@ -233,6 +233,8 @@ public void reset(Map<String, byte[]> generatedResources, Map<String, byte[]> tr
             throw new IllegalStateException("Classloader is not resettable");
         }
         synchronized (this) {
+            // we don't want the previous MemoryClassPathElement to leak as a key of protectionDomains
+            protectionDomains.remove(this.transformedClasses);
             this.transformedClasses = new MemoryClassPathElement(transformedClasses, true);
             resettableElement.reset(generatedResources);
             classPathResourceIndex = null;