Remove 'Mac mac_unopt' in favor of Linux

.ci.yaml

@@ -362,15 +362,7 @@ targets:
       $flutter/osx_sdk : >-
         { "sdk_version": "14a5294e" }
 
-  - name: Mac mac_unopt
-    recipe: engine_v2/engine_v2
-    properties:
-      config_name: mac_unopt
-      add_recipes_cq: "true"
-    timeout: 60
-
   - name: Linux mac_unopt
-    bringup: true
     recipe: engine_v2/engine_v2
     properties:
       config_name: mac_unopt

ci/builders/mac_unopt.json

@@ -30,6 +30,11 @@
                 "config": "host_debug_unopt",
                 "targets": []
             },
+            "properties": {
+                "$flutter/osx_sdk": {
+                    "sdk_version": "14a5294e"
+                }
+            },
             "tests": [
                 {
                     "language": "python3",
@@ -145,6 +150,11 @@
                 "targets": [
                 ]
             },
+            "properties": {
+                "$flutter/osx_sdk": {
+                    "sdk_version": "14a5294e"
+                }
+            },
             "tests": []
         },
         {