Fix ServerMonitor thread name (#1861)

Current thread name is verbose and breaks integration with monitoring tools which prohibit `=` in label values

Co-authored-by: Almas Abdrazak <almas337519@gmail.com>

Author: raipc

driver-core/src/main/com/mongodb/internal/connection/DefaultServerMonitor.java

@@ -181,7 +181,7 @@ class ServerMonitor extends Thread implements AutoCloseable {
         private volatile long lookupStartTimeNanos;
 
         ServerMonitor() {
-            super("cluster-" + serverId.getClusterId() + "-" + serverId.getAddress());
+            super("cluster-" + serverId.getClusterId().getValue() + "-" + serverId.getAddress());
             setDaemon(true);
         }