Exclude script engine from running in omnisharp (#18404)

* Exclude script engine from running in omnisharp

* Fix spacing

omnisharp.json

@@ -13,5 +13,8 @@
      "CscToolPath": null,
      "CscToolExe": null,
      "loadProjectsOnDemand": false
+  },
+  "script": {
+    "enabled": false
   }
 }