[PLAT-12946] Overwrite sshPort in case it is not NULL

Summary:
We were falling back to context.sshPort even in case it was null, which overwrites the
sshPort to null.
This diff fixes the same.

Test Plan: Manual Testing

Reviewers: vbansal

Reviewed By: vbansal

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D32811

managed/src/main/java/com/yugabyte/yw/common/NodeUniverseManager.java

@@ -471,10 +471,10 @@ private void addConnectionParams(
         String sshPort = provider.getDetails().sshPort.toString();
         commandArgs.add("ssh");
         // Default SSH port can be the custom port for custom images.
-        if (context.getSshPort() == null
+        if (StringUtils.isBlank(context.getSshPort())
             && Util.isAddressReachable(node.cloudInfo.private_ip, 22)) {
           sshPort = "22";
-        } else {
+        } else if (!StringUtils.isNotBlank(context.getSshPort())) {
           sshPort = context.getSshPort();
         }
         commandArgs.add("--port");