Add flag to enable user disabled error for slicing

Test: atest SlicePurchaseControllerTest
Bug: 307378699
Change-Id: Ifb22ee48fa09ee92ff2ee25fdb347de139c1cc26
diff --git a/flags/data.aconfig b/flags/data.aconfig
index 8d05a51..7bfa416 100644
--- a/flags/data.aconfig
+++ b/flags/data.aconfig
@@ -26,4 +26,11 @@
   namespace: "telephony"
   description: "Force networks that have PRIORITIZE_BANDWIDTH or PRIORITIZE_LATENCY to be metered."
   bug: "301310451"
+  }
+
+flag {
+  name: "slicing_additional_error_codes"
+  namespace: "telephony"
+  description: "Support additional slicing error codes and functionality."
+  bug: "307378699"
 }