[Tech]: Start migrating to Jest for tests (#9610)

* tech: investigating karma + jest mix

* tech: migrating tests to jest

* tech: moved anoter test file to jest

* test: migrated two more test files to jest

* test: updated readme and made test fail to verify that it causes CI build failure

* tech: added code coverage for jest tests

* tech: testing codecov coverage

* tech: migrated more tests

* tech: migrated template srv to typescript and the tests to jest

* tech: minor build fix

* tech: build fixes

* build: another attempt at fixing go test with coverage

scripts/grunt/default_task.js

@@ -14,6 +14,7 @@ module.exports = function(grunt) {
     'jshint',
     'sasslint',
     'exec:tslint',
+    "exec:jest",
     'karma:test',
     'no-only-tests'
   ]);