Run live managed identity tests in westus2 (#23682)

sdk/azidentity/ci.yml

@@ -29,6 +29,7 @@ extends:
           SubscriptionConfigurations:
             - $(sub-config-identity-test-resources)
       EnableRaceDetector: true
+      Location: westus2
       RunLiveTests: true
       ServiceDirectory: azidentity
       UsePipelineProxy: false