fix(server): invalidate old user avatar when updated (#7285)

fix CLOUD-41

packages/backend/server/tests/utils/utils.ts

@@ -6,6 +6,7 @@ import { PrismaClient } from '@prisma/client';
 import cookieParser from 'cookie-parser';
 import graphqlUploadExpress from 'graphql-upload/graphqlUploadExpress.mjs';
 import type { Response } from 'supertest';
+import supertest from 'supertest';
 
 import { AppModule, FunctionalityModules } from '../../src/app.module';
 import { AuthGuard, AuthModule } from '../../src/core/auth';
@@ -147,3 +148,15 @@ export function handleGraphQLError(resp: Response) {
     throw new Error(stacktrace ? stacktrace.join('\n') : cause.message, cause);
   }
 }
+
+export function gql(app: INestApplication, query?: string) {
+  const req = supertest(app.getHttpServer())
+    .post('/graphql')
+    .set({ 'x-request-id': 'test', 'x-operation-name': 'test' });
+
+  if (query) {
+    return req.send({ query });
+  }
+
+  return req;
+}