Improve test-level system property isolation for EnterpriseParallelJU…

…nitClassRunner [HZ-4592] [HZ-4585] (hazelcast#1126)

Sets license key early so InheritableThreadLocal in
ThreadLocalProperties is not materialized too early and [shared by test
threads](https://github.com/hazelcast/hazelcast-enterprise/issues/7073#issuecomment-1995121029).

Fixes HZ-4592
Fixes https://github.com/hazelcast/hazelcast-enterprise/issues/7073
Fixes https://github.com/hazelcast/hazelcast-enterprise/issues/7072
(ultimately)

GitOrigin-RevId: 822a2249871fb71fbac65866f43c99465a79c1bd

hazelcast/src/test/java/com/hazelcast/test/HazelcastParallelClassRunner.java

@@ -130,7 +130,10 @@ public void evaluate() throws Throwable {
                 // save the current system properties
                 Properties currentSystemProperties = System.getProperties();
                 try {
-                    // use thread-local based system properties so parallel tests don't effect each other
+                    // use thread-local based system properties so parallel tests don't affect each other
+                    // Note that proper isolation requires that no other element of the test framework accesses
+                    // system properties too early, between creation of ThreadLocalProperties and starting test
+                    // thread. Otherwise, many threads will inherit shared Properties instance.
                     System.setProperties(new ThreadLocalProperties(currentSystemProperties));
                     HazelcastParallelClassRunner.super.childrenInvoker(notifier).evaluate();
                     // wait for all child threads (tests) to complete