Add contexts to mac_ios targets. (#141494)

This is required to remove explicit contexts from recipes.

.ci.yaml

@@ -108,6 +108,10 @@ platform_properties:
         }
   mac_benchmark:
     properties:
+      contexts: >-
+        [
+          "osx_sdk"
+        ]
       dependencies: >-
         [
           {"dependency": "apple_signing", "version": "version:to_2024"}
@@ -140,6 +144,10 @@ platform_properties:
         }
   mac_build_test:
     properties:
+      contexts: >-
+        [
+          "osx_sdk"
+        ]
       dependencies: >-
         [
           {"dependency": "ruby", "version": "ruby_3.1-pod_1.13"},
@@ -185,6 +193,10 @@ platform_properties:
       device_type: "Pixel 7 Pro"
   mac_ios:
     properties:
+      contexts: >-
+        [
+          "osx_sdk_devicelab"
+        ]
       dependencies: >-
         [
           {"dependency": "ruby", "version": "ruby_3.1-pod_1.13"},
@@ -199,6 +211,10 @@ platform_properties:
         }
   mac_arm64_ios:
     properties:
+      contexts: >-
+        [
+          "osx_sdk_devicelab"
+        ]
       dependencies: >-
         [
           {"dependency": "ruby", "version": "ruby_3.1-pod_1.13"},
@@ -1705,6 +1721,10 @@ targets:
       cores: "8"
       machine_type: "n1-standard-8"
     properties:
+      contexts: >-
+        [
+          "android_virtual_device"
+        ]
       device_type: "none"
       tags: >
         ["devicelab", "linux"]