fix(cloudformation): Support Cloudformation templates as lists (#3270) (

#3277)

Something has changed between Spinnaker 1.15.6 and 1.16.0 with regard to how Cloudformation templates entered into the inline editor in Deck are parsed. Updating Orca to account for this change.

orca-clouddriver/src/main/groovy/com/netflix/spinnaker/orca/clouddriver/tasks/providers/aws/cloudformation/DeployCloudFormationTask.java

@@ -36,6 +36,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
+import java.util.stream.Collectors;
 import javax.annotation.Nonnull;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang3.StringUtils;
@@ -108,6 +109,11 @@ public TaskResult execute(@Nonnull Stage stage) {
     if (templateBody instanceof Map && !((Map) templateBody).isEmpty()) {
       templateBody = new Yaml().dump(templateBody);
       task.put("templateBody", templateBody);
+    } else if (templateBody instanceof List && !((List) templateBody).isEmpty()) {
+      templateBody =
+          ((List<?>) templateBody)
+              .stream().map(part -> new Yaml().dump(part)).collect(Collectors.joining("\n---\n"));
+      task.put("templateBody", templateBody);
     }
     if (!(templateBody instanceof String) || Strings.isNullOrEmpty((String) templateBody)) {
       throw new IllegalArgumentException(