[PLAT-18618]: Pick any random live tserver if the master leader node is not available during PG-Upgrade check

Summary: Pick any random live tserver if the master leader node is not available during the PG-Upgrade check

Test Plan: Tested manually

Reviewers: skurapati

Reviewed By: skurapati

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D47003

Author: vipul-yb

managed/src/main/java/com/yugabyte/yw/commissioner/tasks/subtasks/check/PGUpgradeTServerCheck.java

@@ -108,9 +108,13 @@ public void run() {
     // on the master leader node.
     NodeDetails node =
         isK8sUniverse || isDedicatedNodeUniverse
-            ? universe.getTServersInPrimaryCluster().stream().findAny().get()
+            ? universe.getLiveTServersInPrimaryCluster().stream().findAny().get()
             : universe.getMasterLeaderNode();
 
+    if (node == null && !isK8sUniverse && !isDedicatedNodeUniverse) {
+      node = universe.getLiveTServersInPrimaryCluster().stream().findAny().get();
+    }
+
     try {
       // Clean up the downloaded package from the node.
       cleanUpDownloadedPackage(universe, node, isK8sUniverse);