[7.x] [Console] Move out of legacy + migrate server side to New Platform (#55690)

.i18nrc.json

@@ -1,7 +1,7 @@
 {
   "paths": {
     "common.ui": "src/legacy/ui",
-    "console": "src/legacy/core_plugins/console",
+    "console": "src/plugins/console",
     "core": "src/core",
     "dashboardEmbeddableContainer": "src/plugins/dashboard_embeddable_container",
     "data": [

src/core/server/http/router/response_adapter.ts

@@ -19,6 +19,7 @@
 import { ResponseObject as HapiResponseObject, ResponseToolkit as HapiResponseToolkit } from 'hapi';
 import typeDetect from 'type-detect';
 import Boom from 'boom';
+import * as stream from 'stream';
 
 import {
   HttpResponsePayload,
@@ -112,8 +113,18 @@ export class HapiResponseAdapter {
     return response;
   }
 
-  private toError(kibanaResponse: KibanaResponse<ResponseError>) {
+  private toError(kibanaResponse: KibanaResponse<ResponseError | Buffer | stream.Readable>) {
     const { payload } = kibanaResponse;
+
+    // Special case for when we are proxying requests and want to enable streaming back error responses opaquely.
+    if (Buffer.isBuffer(payload) || payload instanceof stream.Readable) {
+      const response = this.responseToolkit
+        .response(kibanaResponse.payload)
+        .code(kibanaResponse.status);
+      setHeaders(response, kibanaResponse.options.headers);
+      return response;
+    }
+
     // we use for BWC with Boom payload for error responses - {error: string, message: string, statusCode: string}
     const error = new Boom('', {
       statusCode: kibanaResponse.status,