[fix][fn] Fix graceful Pulsar Function shutdown so that consumers and producers are closed (#25157)

Author: lhotari

pulsar-functions/instance/src/main/java/org/apache/pulsar/functions/instance/JavaInstanceRunnable.java

@@ -380,6 +380,8 @@ public void run() {
             if (stats != null) {
                 stats.incrSysExceptions(deathException);
             }
+            // clear possible thread interrupted state so that closing can be handled gracefully
+            Thread.interrupted();
         } finally {
             log.info("Closing instance");
             close();