Adding jest for unit tests

Makefile

client/.gitlab-ci.yml

client/angular.json

client/jest.config.js

client/karma.conf.js

client/package.json

client/src/app/core/containers/app.component.spec.ts

client/src/app/core/containers/app.component.ts

.../src/app/core/containers/not-found-page.component.spec.ts

...nt/src/app/core/containers/unauthorized.component.spec.ts

...t/src/app/portal/containers/portal-home.component.spec.ts

client/src/test.ts

client/tsconfig.json

client/tsconfig.spec.json

client/yarn.lock