fix(@schematics/angular): remove experimentalDecorators from new projects

`experimentalDecorators: true` was required to use constructor DI. With recommendation now to use `inject` for DI, new projects don't need the experimental decorators anymore.

Author: JeanMeche

packages/schematics/angular/workspace/files/tsconfig.json.template

@@ -10,7 +10,6 @@
     "noFallthroughCasesInSwitch": true,<% } %>
     "skipLibCheck": true,
     "isolatedModules": true,
-    "experimentalDecorators": true,
     "importHelpers": true,
     "target": "ES2022",
     "module": "preserve"