podman-etcd: Add cluster-wide force_new_cluster attribute checking

Implement cluster-wide validation of force_new_cluster attribute to resolve
race conditions during automated cluster recovery. The enhancement ensures
agents check for the cluster-wide attribute before falling back to local
etcd revision comparison.

Key changes:

• Enhanced get_force_new_cluster() to query all cluster nodes
• Ensure force_new_cluster is not set in both nodes to prevent conflicting recovery attempts
• Updated startup logic to prioritize cluster-wide attribute checking

fixes OCPBUGS-61117