chore(frontend)!: Migrate to Angular v20+ and zoneless

* feat: make pcts zoneless  #63

* fix: revert deletion of package-lock  #63

* feat: use workaround to update examples  #63

* chore: rebuild package-lock  #63

* feat: make jest tests also zoneless  #63

Author: nevio18324

frontend/angular.json

@@ -14,7 +14,6 @@
           "builder": "@angular/build:application",
           "options": {
             "browser": "src/main.ts",
-            "polyfills": ["zone.js"],
             "tsConfig": "tsconfig.app.json",
             "assets": [
               {
@@ -79,7 +78,6 @@
         "test": {
           "builder": "@angular/build:karma",
           "options": {
-            "polyfills": ["zone.js", "zone.js/testing"],
             "tsConfig": "tsconfig.spec.json",
             "assets": [
               {