remove empty tests

Author: XilaiZhang

ci/builders/mac_android_aot_engine.json

@@ -37,8 +37,7 @@
                 "$flutter/osx_sdk": {
                     "sdk_version": "14c18"
                 }
-            },
-            "tests": []
+            }
         },
         {
             "archives": [
@@ -78,8 +77,7 @@
                 "$flutter/osx_sdk": {
                     "sdk_version": "14c18"
                 }
-            },
-            "tests": []
+            }
         },
         {
             "archives": [
@@ -119,8 +117,7 @@
                 "$flutter/osx_sdk": {
                     "sdk_version": "14c18"
                 }
-            },
-            "tests": []
+            }
         },
         {
             "archives": [
@@ -159,8 +156,7 @@
                 "$flutter/osx_sdk": {
                     "sdk_version": "14c18"
                 }
-            },
-            "tests": []
+            }
         },
         {
             "archives": [
@@ -200,8 +196,7 @@
                 "$flutter/osx_sdk": {
                     "sdk_version": "14c18"
                 }
-            },
-            "tests": []
+            }
         },
         {
             "archives": [
@@ -241,8 +236,7 @@
                 "$flutter/osx_sdk": {
                     "sdk_version": "14c18"
                 }
-            },
-            "tests": []
+            }
         }
     ],
     "generators": [],