Scheduler: do not reboot on PID 1 exit if we are in a test

kernel/src/thread/Scheduler.cpp

@@ -279,7 +279,14 @@ void sched_common_exit(Context* context, int64_t status)
             return true;
         });
     }
-    else { reboot(); }
+    else
+    {
+#ifndef RUN_TEST_AS_INIT
+        reboot();
+#else
+        hang();
+#endif
+    }
     Scheduler::task_yield(context);
 }