fix(jest-utils): use official secondary package format (#300)

Closes #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",