Change test pipeline to run in eastus2
The test resources rely on an ASA account, which isn't available in westus2, the default region.  So, i've adjusted the region to eastus2.
@@ -6,6 +6,7 @@ stages:
AllocateResourceGroup: false
ServiceDirectory: mixedreality
DeployArmTemplate: true
+ Location: eastus2
EnvVars:
AZURE_CLIENT_ID: $(aad-azure-sdk-test-client-id)
AZURE_CLIENT_SECRET: $(aad-azure-sdk-test-client-secret)
