Verify Mac artifact codesigning on x64 and arm64 (#119971)

* Verify Mac artifact codesigning on x64 and arm64

* mac_arm64

Author: jmagman

.ci.yaml

@@ -3215,7 +3215,24 @@ targets:
       - bin/**
       - .ci.yaml
 
-  - name: Mac verify_binaries_codesigned
+  - name: Mac_x64 verify_binaries_codesigned
+    bringup: true
+    enabled_branches:
+      - flutter-\d+\.\d+-candidate\.\d+
+    recipe: flutter/flutter
+    timeout: 60
+    properties:
+      dependencies: >-
+        [
+          {"dependency": "xcode", "version": "14a5294e"}
+        ]
+      tags: >
+        ["framework", "hostonly", "shard", "mac"]
+      validation: verify_binaries_codesigned
+      validation_name: Verify x64 binaries codesigned
+
+  - name: Mac_arm64 verify_binaries_codesigned
+    bringup: true
     enabled_branches:
       - flutter-\d+\.\d+-candidate\.\d+
     recipe: flutter/flutter
@@ -3228,7 +3245,7 @@ targets:
       tags: >
         ["framework", "hostonly", "shard", "mac"]
       validation: verify_binaries_codesigned
-      validation_name: Verify binaries codesigned
+      validation_name: Verify arm64 binaries codesigned
 
   - name: Mac web_tool_tests
     recipe: flutter/flutter_drone