Revert "Skip Xcode install on mac_mokey Android tests (#163685)" (#164581)

This reverts commit 2a6b0158b2.
Revert "Skip Xcode install on mac_mokey Android tests (#163685)"

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [ ] I updated/added relevant documentation (doc comments with `///`).
- [ ] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

.ci.yaml

@@ -252,10 +252,6 @@ platform_properties:
       os: Mac-13|Mac-14
       cpu: x86
       device_type: "mokey"
-      $flutter/osx_sdk : >-
-        {
-          "skip_xcode_install": true
-        }
   mac_arm64_mokey:
     properties:
       dependencies: >-
@@ -266,10 +262,6 @@ platform_properties:
       os: Mac-13|Mac-14
       cpu: arm64
       device_type: "mokey"
-      $flutter/osx_sdk : >-
-        {
-          "skip_xcode_install": true
-        }
 
   mac_pixel_7pro:
     properties: