test: migrate from karma to jest

angular.json

@@ -104,26 +104,6 @@
             "browserTarget": "angular-electron:build"
           }
         },
-        "test": {
-          "builder": "@angular-builders/custom-webpack:karma",
-          "options": {
-            "main": "src/test.ts",
-            "polyfills": "src/polyfills-test.ts",
-            "tsConfig": "src/tsconfig.spec.json",
-            "karmaConfig": "src/karma.conf.js",
-            "scripts": [],
-            "styles": [
-              "src/styles.scss"
-            ],
-            "assets": [
-              "src/assets"
-            ],
-            "customWebpackConfig": {
-              "path": "./angular.webpack.js",
-              "target": "electron-renderer"
-            }
-          }
-        },
         "lint": {
           "builder": "@angular-eslint/builder:lint",
           "options": {
@@ -168,4 +148,4 @@
       "prefix": "app"
     }
   }
-}
+}