fix(migrations): include the output migration in the defaults of the signal migration (angular#58635)

Running `ng g @angular/core:signals` prompts for the question on which migration to run and offers 3 options (inputs, outputs, queries).
Running with `--defaults` skips the prompts, but only runs 2 of them.
This fixes it by including the `outputs` migration in the default ones.

PR Close angular#58635

Author: cexbrayat

packages/core/schematics/ng-generate/signals/schema.json

@@ -8,6 +8,7 @@
       "type": "array",
       "default": [
         "inputs",
+        "outputs",
         "queries"
       ],
       "items": {