feat(editor): Select credentials in template setup if theres only one (#7879)

Automatically select credentials in the template credential setup if
there's only one available.

NOTE! This feature is still behind a feature flag. To test, set:

```js
localStorage.setItem('template-credentials-setup', 'true')
```


https://github.com/n8n-io/n8n/assets/10324676/edc1f586-214f-4c37-b7ec-dd1786433dc1

packages/editor-ui/src/Interface.ts

@@ -817,10 +817,20 @@ export interface ITemplatesWorkflow {
 	};
 }
 
+export interface ITemplatesWorkflowInfo {
+	nodeCount: number;
+	nodeTypes: {
+		[key: string]: {
+			count: number;
+		};
+	};
+}
+
 export interface ITemplatesWorkflowResponse extends ITemplatesWorkflow, IWorkflowTemplate {
 	description: string | null;
 	image: ITemplatesImage[];
 	categories: ITemplatesCategory[];
+	workflowInfo: ITemplatesWorkflowInfo;
 }
 
 /**
@@ -1010,6 +1020,7 @@ export interface IVersionNode {
 }
 
 export interface ITemplatesNode extends IVersionNode {
+	id: number;
 	categories?: ITemplatesCategory[];
 }