Scale-in operation fails on OpenStack Instance HA nodes with "Could not connect to controller: Connection refused" error on "Getting Nova compute hostname" task

Issue

• Scale-in operation fails on OpenStack Instance HA nodes with Could not connect to controller: Connection refused error on Getting Nova compute hostname task

  $ openstack overcloud node delete ......
        :
  2025-01-01 12:49:51.511832 | aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa |      FATAL | Getting Nova compute hostname | instance-ha-compute-0 | error={"changed": true, "cmd": ["crm_node", "-n"], "delta": "0:00:00.006074", "end": "2025-01-01 12:49:51.493368", "msg": "non-zero return code", "rc": 102, "start": "2025-01-01 12:49:51.487294", "stderr": "error: Could not connect to controller: Connection refused", "stderr_lines": ["error: Could not connect to controller: Connection refused"], "stdout": "", "stdout_lines": []}
        :