For `get mc -o json|yaml` we pretend that `spec` field is string and not an actual yaml map. That way you can see the full spec in unformatted view using `talosctl -n <node> get mc -o yaml` or formatted using `talosctl -n <node> get mc -o yaml | yq .spec`. `edit mc` command is unaffected. Fixes #8687 Signed-off-by: Dmitriy Matrenichev <dmitry.matrenichev@siderolabs.com>