Remove mac_unopt

Author: jmagman

.ci.yaml

@@ -345,8 +345,6 @@ targets:
     timeout: 60
     properties:
       config_name: mac_android_aot_engine
-      $flutter/osx_sdk : >-
-        { "sdk_version": "14a5294e" }
 
   - name: Linux mac_android_aot_engine
     bringup: true
@@ -375,14 +373,6 @@ targets:
       add_recipes_cq: "true"
     timeout: 60
 
-  - name: Linux mac_unopt
-    bringup: true
-    recipe: engine_v2/engine_v2
-    properties:
-      config_name: mac_unopt
-      add_recipes_cq: "true"
-    timeout: 60
-
   - name: Mac Unopt
     bringup: true
     recipe: engine/engine_unopt