fix(Playwright): Fixes Imports in MockContentPluginWrapper

Also keeping reference to `babel-jest` for version 27 as a left-over
from previous results to debug failed module-resolution because
of typo in tsconfig.json. It seems to make sense, to keep this in
sync with "rolled back to Jest 27" to work around
playwright-community/jest-playwright#796

itest/package.json

@@ -27,6 +27,7 @@
     "@types/node": "^16.11.26",
     "@typescript-eslint/eslint-plugin": "^5.9.1",
     "@typescript-eslint/parser": "^5.9.1",
+    "babel-jest": "^27.5.1",
     "enhanced-resolve": "^5.9.3",
     "eslint": "^8.6.0",
     "eslint-config-prettier": "^8.3.0",

itest/src/aut/MockContentPluginWrapper.ts

@@ -1,15 +1,8 @@
 import { Wrapper } from "./Wrapper";
-//import MockContentPlugin from "@coremedia/ckeditor5-coremedia-studio-integration-mock/src/content/MockContentPlugin";
 import { ClassicEditorWrapper } from "./ClassicEditorWrapper";
-//import { MockContentConfig } from "@coremedia/ckeditor5-coremedia-studio-integration-mock/src/content/MockContent";
-import Plugin from "@ckeditor/ckeditor5-core/src/plugin";
+import MockContentPlugin from "@coremedia/ckeditor5-coremedia-studio-integration-mock/content/MockContentPlugin";
+import { MockContentConfig } from "@coremedia/ckeditor5-coremedia-studio-integration-mock/content/MockContent";
 
-// TODO: Workaround: We cannot resolve modules currently.
-declare interface MockContentConfig {
-}
-declare class MockContentPlugin extends Plugin {
-  addContents(...data: MockContentConfig[]): void;
-}
 /**
  * Provides access to the `MockContentPlugin`.
  */