fix mocks (#713)

packages/medusa-plugin-contentful/__mocks__/contentful-management.js

@@ -1,10 +0,0 @@
-"use strict";
-
-Object.defineProperty(exports, "__esModule", {
-  value: true
-});
-exports.ContentfulMock = void 0;
-var ContentfulMock = {
-  createClient: jest.fn()
-};
-exports.ContentfulMock = ContentfulMock;

packages/medusa-plugin-contentful/src/services/__mocks__/contentful-management.js

@@ -1,4 +1,5 @@
 export const createClient = jest.fn()
+
 const mock = jest.fn().mockImplementation(() => {
   return { createClient }
 })