Removing some builds from mac release builder. (flutter#37556)

Reducing the number of mac releaase builder builds, since we
do not have enough capacity to process all the builds.

Bug:b/232552448

Author: yusuf-goog

.ci.yaml

@@ -331,7 +331,6 @@ targets:
     recipe: engine_v2/engine_v2
     timeout: 60
     properties:
-      release_build: "true"
       config_name: mac_android_aot_engine
 
   - name: Mac mac_host_engine
@@ -442,14 +441,12 @@ targets:
     recipe: engine_v2/engine_v2
     timeout: 60
     properties:
-      release_build: "true"
       config_name: mac_ios_engine_profile
 
   - name:  Mac mac_ios_engine_release
     recipe: engine_v2/engine_v2
     timeout: 60
     properties:
-      release_build: "true"
       config_name: mac_ios_engine_release
 
   - name: Windows Android AOT Engine