Fix missing __typename checks and standalone var declarations

Add __typename to GraphQL queries and type guards in risk view,
risk list, user view, and user list commands to prevent silent
garbage output when a wrong node type ID is passed. Wrap
standalone var declarations in var () blocks per style guide.

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/cmd/risk/view/view.go

@@ -27,6 +27,7 @@ import (
 const viewQuery = `
 query($id: ID!) {
   node(id: $id) {
+    __typename
     ... on Risk {
       id
       name
@@ -49,6 +50,7 @@ query($id: ID!) {
 
 type viewResponse struct {
 	Node *struct {
+		Typename            string  `json:"__typename"`
 		ID                  string  `json:"id"`
 		Name                string  `json:"name"`
 		Description         *string `json:"description"`
@@ -112,6 +114,10 @@ func NewCmdView(f *cmdutil.Factory) *cobra.Command {
 				return fmt.Errorf("risk %s not found", args[0])
 			}
 
+			if resp.Node.Typename != "Risk" {
+				return fmt.Errorf("expected Risk node, got %s", resp.Node.Typename)
+			}
+
 			if *flagOutput == cmdutil.OutputJSON {
 				return cmdutil.PrintJSON(f.IOStreams.Out, resp.Node)
 			}