feat(editor): Add new /templates/search endpoint (#8227)

Updating n8n front-end to use the new search endpoint powered by TypeSense.

Endpoint is deployed on staging API so, in order to test it, use this env var:
```export N8N_TEMPLATES_HOST=https://api-staging.n8n.io/api```

**NOTE**: This PR should not be merged until [backend changes](https://github.com/n8n-io/creators-site/pull/118) are merged and released.

## Related tickets and issues
https://linear.app/n8n/issue/ADO-1555/update-in-app-search-to-work-with-the-new-back-end


## Review / Merge checklist
- [x] PR title and summary are descriptive. **Remember, the title automatically goes into the changelog. Use `(no-changelog)` otherwise.** ([conventions](https://github.com/n8n-io/n8n/blob/master/.github/pull_request_title_conventions.md))
- [ ] Tests included.
   > A bug is not considered fixed, unless a test is added to prevent it from happening again.
   > A feature is not complete without tests.

packages/editor-ui/src/Interface.ts

@@ -830,6 +830,19 @@ export interface ITemplatesWorkflowInfo {
 	};
 }
 
+export type TemplateSearchFacet = {
+	field_name: string;
+	sampled: boolean;
+	stats: {
+		total_values: number;
+	};
+	counts: Array<{
+		count: number;
+		highlighted: string;
+		value: string;
+	}>;
+};
+
 export interface ITemplatesWorkflowResponse extends ITemplatesWorkflow, IWorkflowTemplate {
 	description: string | null;
 	image: ITemplatesImage[];
@@ -845,7 +858,7 @@ export interface ITemplatesWorkflowFull extends ITemplatesWorkflowResponse {
 }
 
 export interface ITemplatesQuery {
-	categories: number[];
+	categories: string[];
 	search: string;
 }
 
@@ -1357,7 +1370,7 @@ export interface INodeTypesState {
 }
 
 export interface ITemplateState {
-	categories: { [id: string]: ITemplatesCategory };
+	categories: ITemplatesCategory[];
 	collections: { [id: string]: ITemplatesCollection };
 	workflows: { [id: string]: ITemplatesWorkflow | ITemplatesWorkflowFull };
 	workflowSearches: {
@@ -1365,6 +1378,7 @@ export interface ITemplateState {
 			workflowIds: string[];
 			totalWorkflows: number;
 			loadingMore?: boolean;
+			categories?: ITemplatesCategory[];
 		};
 	};
 	collectionSearches: {