**What kind of change does this PR introduce?**
Adds Jest in `ng-schematics`. So you can scaffold test with Jest instead
of Jasmine
**Did you add tests for your changes?**
Yes
**If relevant, did you update the documentation?**
No
**Summary**
Users can more easily integrate test with Puppeteer and their library of
choose.
**Does this PR introduce a breaking change?**
No
**Other information**
