[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

jest.config.js

@@ -0,0 +1,23 @@
+
+module.exports = {
+  verbose: false,
+  "transform": {
+    "^.+\\.tsx?$": "<rootDir>/node_modules/ts-jest/preprocessor.js"
+  },
+  "moduleDirectories": ["<rootDir>node_modules", "<rootDir>/public"],
+  "roots": [
+    "<rootDir>/public"
+  ],
+  "testRegex": "(\\.|/)(jest)\\.(jsx?|tsx?)$",
+  "moduleFileExtensions": [
+    "ts",
+    "tsx",
+    "js",
+    "jsx",
+    "json"
+  ],
+  "setupFiles": [
+    "./public/test/jest-shim.ts",
+    "./public/test/jest-setup.ts"
+  ]
+};