[BUG] Fix integration test error in AADWebApiOboIT.

[chenrujun]

For Azure China, the scope of graph should be https://microsoftgraph.chinacloudapi.cn/User.Read.
But in current integration test, it's https://graph.microsoft.com/User.Read.

An email MSAL is not supported in National Clouds today, so AADWebApiOboIT should failed after updated to https://microsoftgraph.chinacloudapi.cn/User.Read.

Refs:

1. Azure China:
   
2. https://github.com/Azure/azure-sdk-for-java/blob/azure-spring-boot_3.7.0/sdk/spring/azure-spring-boot-test-aad-webapp-and-resource-server-with-obo/src/test/java/com/azure/test/aad/webapi/obo/AADWebApiOboIT.java#L51
3. Email ADAL to MSAL not supported in National Clouds.

[chenrujun]

Putting off this task because @zhichengliu12581 is busy with other tasks, and this task does not have high priority.

[chenrujun]

Closing this issue, because AAD related integration tests have already been deleted in version 4.0.