fix: use official secondary package format

this fixes the `@testing-library/angular/spec-utils` import in Jest v28
closes testing-library#299

Author: dzonatan

angular.json

@@ -3,7 +3,6 @@
   "projects": {
     "example-app": "apps/example-app",
     "example-app-karma": "apps/example-app-karma",
-    "jest-utils": "projects/jest-utils",
     "testing-library": "projects/testing-library"
   }
 }

package.json

@@ -7,7 +7,7 @@
     "postinstall": "node ./decorate-angular-cli.js && ngcc --properties es2015 browser module main",
     "start": "nx serve",
     "prebuild": "rimraf dist",
-    "build": "nx run-many --target=build --projects=testing-library,jest-utils",
+    "build": "nx run-many --target=build --projects=testing-library",
     "build:schematics": "tsc -p ./projects/testing-library/tsconfig.schematics.json",
     "test": "nx run-many --target=test --all",
     "lint": "nx workspace-lint && nx lint",

projects/jest-utils/.eslintrc.json

@@ -0,0 +1 @@
+{}

projects/jest-utils/jest.config.js

@@ -23,7 +23,7 @@
     "noUnusedParameters": true,
     "paths": {
       "@testing-library/angular": ["projects/testing-library"],
-      "@testing-library/angular/jest-utils": ["projects/jest-utils"]
+      "@testing-library/angular/jest-utils": ["projects/testing-library/jest-utils"]
     }
   },
   "exclude": ["node_modules", "tmp"]