deps(workbench): update @scion/workbench to Angular 15

closes #347

BREAKING CHANGE: Updating `@scion/workbench` to Angular 15 introduced a breaking change.

To migrate:
- update your application to Angular 15.x; for detailed migration instructions, refer to https://v15.angular.io/guide/update-to-latest-version;
- update @scion/components to version 15; for detailed migration instructions, refer to https://github.com/SchweizerischeBundesbahnen/scion-toolkit/blob/master/CHANGELOG_COMPONENTS.md;

.eslintrc.json

@@ -9,12 +9,8 @@
       "files": [
         "*.ts"
       ],
-      "parserOptions": {
-        "project": [
-          "tsconfig.json"
-        ]
-      },
       "extends": [
+        "eslint:recommended",
         "plugin:@typescript-eslint/recommended",
         "plugin:@angular-eslint/recommended",
         "plugin:@angular-eslint/template/process-inline-templates",

angular.json

@@ -347,5 +347,13 @@
         }
       }
     }
+  },
+  "schematics": {
+    "@angular-eslint/schematics:application": {
+      "setParserOptionsProject": true
+    },
+    "@angular-eslint/schematics:library": {
+      "setParserOptionsProject": true
+    }
   }
 }

apps/workbench-client-testing-app/.eslintrc.json

@@ -9,9 +9,7 @@
         "*.ts"
       ],
       "parserOptions": {
-        "project": [
-          "apps/workbench-client-testing-app/tsconfig.app.eslint.json"
-        ]
+        "project": "apps/workbench-client-testing-app/tsconfig.app.eslint.json"
       },
       "rules": {
         "@angular-eslint/directive-selector": [

apps/workbench-testing-app/.eslintrc.json

@@ -9,9 +9,7 @@
         "*.ts"
       ],
       "parserOptions": {
-        "project": [
-          "apps/workbench-testing-app/tsconfig.app.eslint.json"
-        ]
+        "project": "apps/workbench-testing-app/tsconfig.app.eslint.json"
       },
       "rules": {
         "@angular-eslint/directive-selector": [