Use the same parent CL for both test and dev

The isolated test CL does not need to access anything from the dev CL,
and it just causes leakage problems.

Fixes quarkusio#19888

core/deployment/src/main/java/io/quarkus/deployment/dev/testing/TestSupport.java

@@ -129,7 +129,7 @@ public void init() {
                         .setAssertionsEnabled(true)
                         .setDisableClasspathCache(false)
                         .setIsolateDeployment(true)
-                        .setBaseClassLoader(getClass().getClassLoader())
+                        .setBaseClassLoader(getClass().getClassLoader().getParent())
                         .setTest(true)
                         .setAuxiliaryApplication(true)
                         .setHostApplicationIsTestOnly(devModeType == DevModeType.TEST_ONLY)