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.

cypress/pages/templates.ts

@@ -7,6 +7,14 @@ export class TemplatesPage extends BasePage {
 		useTemplateButton: () => cy.getByTestId('use-template-button'),
 		templateCards: () => cy.getByTestId('template-card'),
 		firstTemplateCard: () => this.getters.templateCards().first(),
+		allCategoriesFilter: () => cy.getByTestId('template-filter-all-categories'),
+		searchInput: () => cy.getByTestId('template-search-input'),
+		categoryFilters: () => cy.get('[data-test-id^=template-filter]'),
+		categoryFilter: (category: string) => cy.getByTestId(`template-filter-${category}`),
+		collectionCountLabel: () => cy.getByTestId('collection-count-label'),
+		templateCountLabel: () => cy.getByTestId('template-count-label'),
+		templatesLoadingContainer: () => cy.getByTestId('templates-loading-container'),
+		expandCategoriesButton: () => cy.getByTestId('expand-categories-button'),
 	};
 
 	actions = {