[azure_fence.py] Endpoint for Azure Germany is missing

The Azure Germany URL endpoint is not defined in the corresponding function.

```
def get_azure_arm_endpoints(cloudName, authority):
cloudEnvironment = {
"authority_hosts": authority
}

if cloudName == "AZURE_CHINA_CLOUD":
cloudEnvironment["resource_manager"] = "https://management.chinacloudapi.cn/"
cloudEnvironment["credential_scopes"] = ["https://management.chinacloudapi.cn/.default"]
return cloudEnvironment

if cloudName == "AZURE_US_GOV_CLOUD":
cloudEnvironment["resource_manager"] = "https://management.usgovcloudapi.net/"
cloudEnvironment["credential_scopes"] = ["https://management.core.usgovcloudapi.net/.default"]
return cloudEnvironment

if cloudName == "AZURE_PUBLIC_CLOUD":
cloudEnvironment["resource_manager"] = "https://management.azure.com/"
cloudEnvironment["credential_scopes"] = ["https://management.azure.com/.default"]
return cloudEnvironment
```

According to Microsoft's documentation, it should be "https://management.microsoftazure.de/"

Control plane
https://learn.microsoft.com/en-us/azure/azure-resource-manager/management/control-plane-and-data-plane#control-plane

Open azure_fence.py and inspect get_azure_arm_endpoints alongside the existing cloud-specific branches. Add the missing Azure Germany endpoint using the URL given in the issue, then verify that the function returns the expected resource manager endpoint and credential scope for that cloud.

Written by the indexing model from the issue text.