Update to JSON Forms 3.5.1 and Angular 19

- Update to JSON Forms 3.5.1
- Update to Angular 19
- Update tsconfigs with new set based on a new project generated with Angular 19 CLI
- Fix code to adhere to new tsconfigs higher standards
- Remove protractor E2E tests because protractor is end of life and Angular now refuses to even execute the tests
- Remove obsolete tslint.json
- Remove lint script because there currently is no lint config at all and ng lint requires additional setup/config
- Fix unit test

Author: lucas-koehler

angular.json

@@ -14,7 +14,7 @@
             "outputPath": "dist",
             "index": "src/index.html",
             "main": "src/main.ts",
-            "tsConfig": "src/tsconfig.app.json",
+            "tsConfig": "tsconfig.app.json",
             "polyfills": "src/polyfills.ts",
             "assets": [
               "src/assets",
@@ -82,7 +82,7 @@
               "zone.js",
               "zone.js/testing"
             ],
-            "tsConfig": "src/tsconfig.spec.json",
+            "tsConfig": "tsconfig.spec.json",
             "scripts": [],
             "styles": [
               "src/styles.css"
@@ -94,20 +94,6 @@
           }
         }
       }
-    },
-    "jsonforms-angular-material-playground-e2e": {
-      "root": "e2e",
-      "sourceRoot": "e2e",
-      "projectType": "application",
-      "architect": {
-        "e2e": {
-          "builder": "@angular-devkit/build-angular:protractor",
-          "options": {
-            "protractorConfig": "./protractor.conf.js",
-            "devServerTarget": "jsonforms-angular-material-playground:serve"
-          }
-        }
-      }
     }
   },
   "schematics": {