Fix Azure resource client import (#3988)

Co-authored-by: Andrey Cheptsov <andrey.cheptsov@github.com>

Author: peterschmidt85

src/dstack/_internal/core/backends/azure/configurator.py

@@ -6,7 +6,6 @@
 from azure.core.credentials import TokenCredential
 from azure.mgmt import msi as msi_mgmt
 from azure.mgmt import network as network_mgmt
-from azure.mgmt import resource as resource_mgmt
 from azure.mgmt import subscription as subscription_mgmt
 from azure.mgmt.network.models import (
     AddressSpace,
@@ -18,6 +17,7 @@
     Subnet,
     VirtualNetwork,
 )
+from azure.mgmt.resource import resources as resource_mgmt
 from azure.mgmt.resource.resources.models import ResourceGroup
 
 from dstack._internal.core.backends.azure import auth, compute, resources

src/tests/_internal/server/routers/test_backends.py

@@ -492,9 +492,15 @@ async def test_create_azure_backend(self, test_db, session: AsyncSession, client
         }
         with (
             patch("dstack._internal.core.backends.azure.auth.authenticate") as authenticate_mock,
-            patch("azure.mgmt.subscription.SubscriptionClient") as SubscriptionClientMock,
-            patch("azure.mgmt.resource.ResourceManagementClient") as ResourceManagementClientMock,
-            patch("azure.mgmt.network.NetworkManagementClient") as NetworkManagementClientMock,
+            patch(
+                "dstack._internal.core.backends.azure.configurator.subscription_mgmt.SubscriptionClient"
+            ) as SubscriptionClientMock,
+            patch(
+                "dstack._internal.core.backends.azure.configurator.resource_mgmt.ResourceManagementClient"
+            ) as ResourceManagementClientMock,
+            patch(
+                "dstack._internal.core.backends.azure.configurator.network_mgmt.NetworkManagementClient"
+            ) as NetworkManagementClientMock,
         ):
             authenticate_mock.return_value = None, "test_tenant"
             subscription_client_mock = SubscriptionClientMock.return_value