Fix successful tests counting not working in Gradle build by adding ReflectPermission back (see #apache#13146)

Author: uschindler

gradle/testing/randomization/policies/replicator-tests.policy

@@ -54,6 +54,8 @@ grant {
   permission java.lang.RuntimePermission "getStackTrace";
   // needed for mock filesystems in tests
   permission java.lang.RuntimePermission "fileSystemProvider";
+  // test runner seems to require supression of access checks:
+  permission java.lang.reflect.ReflectPermission "suppressAccessChecks";
 };
 
 // Permissions to support ant build

gradle/testing/randomization/policies/tests.policy

@@ -50,6 +50,8 @@ grant {
   permission java.lang.RuntimePermission "getStackTrace";
   // needed for mock filesystems in tests
   permission java.lang.RuntimePermission "fileSystemProvider";
+  // test runner seems to require supression of access checks:
+  permission java.lang.reflect.ReflectPermission "suppressAccessChecks";
   // needed by cyberneko usage by benchmarks on J9
   permission java.lang.RuntimePermission "accessClassInPackage.org.apache.xerces.util";