Enable nullish/optional-chain template diagnostics for clean example code

Author: AlisherAmonulloev

Angular/tsconfig.app.json

@@ -10,13 +10,5 @@
   ],
   "include": [
     "src/**/*.d.ts"
-  ],
-  "angularCompilerOptions": {
-    "extendedDiagnostics": {
-      "checks": {
-        "nullishCoalescingNotNullable": "suppress",
-        "optionalChainNotNullable": "suppress"
-      }
-    }
-  }
+  ]
 }

Angular/tsconfig.spec.json

@@ -10,13 +10,5 @@
   "include": [
     "src/**/*.spec.ts",
     "src/**/*.d.ts"
-  ],
-  "angularCompilerOptions": {
-    "extendedDiagnostics": {
-      "checks": {
-        "nullishCoalescingNotNullable": "suppress",
-        "optionalChainNotNullable": "suppress"
-      }
-    }
-  }
+  ]
 }