Show operation id's by default (SwaggerUI)

Passes displayOperationId: true in the swagger config

Changelog: fixed

app/assets/javascripts/blob/openapi/index.js

@@ -11,6 +11,7 @@ export default () => {
         url: el.dataset.endpoint,
         dom_id: '#js-openapi-viewer',
         deepLinking: true,
+        displayOperationId: true,
       });
     })
     .catch((error) => {

spec/frontend/blob/openapi/index_spec.js

+import { SwaggerUIBundle } from 'swagger-ui-dist';
+import renderOpenApi from '~/blob/openapi';
+
+jest.mock('swagger-ui-dist');
+
+describe('OpenAPI blob viewer', () => {
+  const id = 'js-openapi-viewer';
+  const mockEndpoint = 'some/endpoint';
+
+  beforeEach(() => {
+    setFixtures(`<div id="${id}" data-endpoint="${mockEndpoint}"></div>`);
+    renderOpenApi();
+  });
+
+  it('initializes SwaggerUI with the correct configuration', () => {
+    expect(SwaggerUIBundle).toHaveBeenCalledWith({
+      url: mockEndpoint,
+      dom_id: `#${id}`,
+      deepLinking: true,
+      displayOperationId: true,
+    });
+  });
+});