Add configure_test_clusters_with_one_processor to repro line printer (e…

…lastic#89562)

Ass a follow up to elastic#89234, we want to also include this system property
in reproduction lines so that developers are actually enabling this
setting when trying to reproduce these failures.

test/framework/src/main/java/org/elasticsearch/test/junit/listeners/ReproduceInfoPrinter.java

@@ -172,7 +172,8 @@ private ReproduceErrorMessageBuilder appendESProperties() {
                 "tests.heap.size",
                 "tests.bwc",
                 "tests.bwc.version",
-                "build.snapshot"
+                "build.snapshot",
+                "tests.configure_test_clusters_with_one_processor"
             );
             if (System.getProperty("tests.jvm.argline") != null && System.getProperty("tests.jvm.argline").isEmpty() == false) {
                 appendOpt("tests.jvm.argline", "\"" + System.getProperty("tests.jvm.argline") + "\"");