c/health: added validation of received health report node_id

Added validation of the node_id of the reply received from the node. The
report is not considered as valid if the reply node id doesn't match the
id of node the report was sent to.

Signed-off-by: Michał Maślanka <michal@redpanda.com>

src/v/cluster/health_monitor_backend.cc

@@ -370,20 +370,23 @@ health_monitor_backend::collect_remote_node_health(model::node_id id) {
       });
 }
 
-result<node_health_report>
-map_reply_result(result<get_node_health_reply> reply) {
+result<node_health_report> map_reply_result(
+  model::node_id target_node_id, result<get_node_health_reply> reply) {
     if (!reply) {
         return {reply.error()};
     }
     if (!reply.value().report.has_value()) {
         return {reply.value().error};
     }
+    if (reply.value().report->id != target_node_id) {
+        return {errc::invalid_target_node_id};
+    }
     return {std::move(*reply.value().report).to_in_memory()};
 }
 
 result<node_health_report> health_monitor_backend::process_node_reply(
   model::node_id id, result<get_node_health_reply> reply) {
-    auto res = map_reply_result(std::move(reply));
+    auto res = map_reply_result(id, std::move(reply));
     auto [status_it, _] = _status.try_emplace(id);
     if (!res) {
         vlog(