Potential macOS CI setup issue

rules_apple tests started failing without any changes there between

this successful build https://buildkite.com/bazel/rules-apple-darwin/builds/4659 on 10/20
and this failing build https://buildkite.com/bazel/rules-apple-darwin/builds/4664 on 10/22

This type of test failure:

```
The test runner encountered an error (Failed to establish communication with the test runner. If you believe this error represents a bug, please attach the result bundle at /Users/buildkite/Library/Developer/Xcode/DerivedData/temporary-hgmhctgbjdblljdswqfgutoosvlw/Logs/Test/Test-Transient Testing-2021.10.29_17-57-24-+0000.xcresult. (Underlying Error: Couldn’t communicate with a helper application. Try your operation again. If that fails, quit and relaunch the application and try again. The connection to service on pid 0 named com.apple.testmanagerd.control was invalidated.))
```

Is often related to the machine setup, but it's hard to say specifically what would be the issue here if the Xcode `-runFirstLaunch` command was run after any changes.