[fix][broker] Fix the loss of bundle stats data reported to zookeeper, when the updateStats method is executed (#19887)

Co-authored-by: lordcheng10 <lordcheng1020@gmail.com>

Author: lordcheng10

pulsar-broker/src/main/java/org/apache/pulsar/broker/service/PulsarStats.java

@@ -233,7 +233,7 @@ public synchronized void updateStats(
         updatedAt = System.currentTimeMillis();
     }
 
-    public NamespaceBundleStats invalidBundleStats(String bundleName) {
+    public synchronized NamespaceBundleStats invalidBundleStats(String bundleName) {
         return bundleStats.remove(bundleName);
     }
 
@@ -254,7 +254,7 @@ public BrokerOperabilityMetrics getBrokerOperabilityMetrics() {
         return brokerOperabilityMetrics;
     }
 
-    public Map<String, NamespaceBundleStats> getBundleStats() {
+    public synchronized Map<String, NamespaceBundleStats> getBundleStats() {
         return bundleStats;
     }