test(storagemover): skip cross-sub sync tests on mindependency leg

Build 6327088 showed test_job_definition_job_run and
test_start_c2c_job_with_private_source still failing on the
mindependency leg with 'msrestazure.azure_exceptions.CloudError:
InvalidAuthenticationToken'. Root cause: the floor-pinned
azure-mgmt-storage (v2019_06_01) uses msrestazure transport which
bypasses azure-core's RequestsTransport, and therefore the
test-proxy, hitting live ARM instead of replaying the cassette.

Detect the modernization line via the presence of the .aio submodule
on azure-mgmt-storage/-network plus the v2022_04_01 namespace on
azure-mgmt-authorization, and gate both cross-sub sync tests behind
a pytest.mark.skipif that triggers when those signals are absent.
The matrix-#11/#12/#13 schedule tests in the same file (which do not
use cross-sub clients) are unaffected and continue to run in
mindependency.

The cross-sub imports themselves are now wrapped in try/except so the
module collects cleanly when those packages are too old to even
provide the symbols (otherwise mindependency would fail on the
from-import line before the skipif could fire).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Suyash Choudhary

sdk/storagemover/azure-mgmt-storagemover/tests/test_storage_mover_mgmt_job_definitions_operations_test.py

@@ -18,13 +18,42 @@
 
 import pytest
 from azure.core.exceptions import HttpResponseError
-from azure.mgmt.authorization.v2022_04_01 import AuthorizationManagementClient
-from azure.mgmt.network import NetworkManagementClient
-from azure.mgmt.storage import StorageManagementClient
 from azure.mgmt.storagemover import StorageMoverMgmtClient
 
 from devtools_testutils import AzureMgmtRecordedTestCase, RandomNameResourceGroupPreparer, recorded_by_proxy
 
+# Detect whether the cross-sub mgmt clients are "modern enough" to flow through
+# azure-core's RequestsTransport (which the test-proxy intercepts). The pre-20.0
+# generations of azure-mgmt-storage / azure-mgmt-network / azure-mgmt-authorization
+# use msrestazure's transport, bypass the proxy, and hit live ARM. The presence
+# of the `.aio` submodule + the `v2022_04_01` authorization API version is a
+# reliable signal of "post-modernization".
+# The `mindependency` CI leg pins those packages to very old floors that lack
+# these — skip the two cross-sub tests cleanly in that environment.
+try:
+    from azure.mgmt.authorization.v2022_04_01 import AuthorizationManagementClient
+    from azure.mgmt.network import NetworkManagementClient
+    from azure.mgmt.storage import StorageManagementClient
+    import azure.mgmt.network.aio  # noqa: F401  (modernization signal)
+    import azure.mgmt.storage.aio  # noqa: F401  (modernization signal)
+    _CROSS_SUB_CLIENTS_MODERN = True
+except ImportError:
+    AuthorizationManagementClient = None  # type: ignore[assignment]
+    NetworkManagementClient = None  # type: ignore[assignment]
+    StorageManagementClient = None  # type: ignore[assignment]
+    _CROSS_SUB_CLIENTS_MODERN = False
+
+_SKIP_IF_CROSS_SUB_CLIENTS_OLD = pytest.mark.skipif(
+    not _CROSS_SUB_CLIENTS_MODERN,
+    reason=(
+        "Cross-sub mgmt clients too old: pre-modernization versions of "
+        "azure-mgmt-{storage,network,authorization} use msrestazure transport "
+        "and bypass the test-proxy, hitting live ARM. Bump those packages to "
+        "their post-azure-core releases (storage>=20, network>=19, authorization>=2) "
+        "to enable this test."
+    ),
+)
+
 AZURE_LOCATION = "eastus"
 # Matrix row #31 runs in westcentralus because the shared PLS + storage account
 # live there. Other tests in this file keep the default eastus location.
@@ -125,6 +154,7 @@ def _provision_parents(self, rg, sm_name, project_name, source_endpoint, target_
     # Connection / PrivateLinkService approval — the public bucket is reachable
     # via the MCC directly.
 
+    @_SKIP_IF_CROSS_SUB_CLIENTS_OLD
     @RandomNameResourceGroupPreparer(location=WCUS_LOCATION)
     @recorded_by_proxy
     def test_job_definition_job_run(self, resource_group, **kwargs):
@@ -489,6 +519,7 @@ def test_create_with_onetime_schedule(self, resource_group, **kwargs):
     # See the "Porter's reference" callout in the cross-language playbook
     # (storage-mover-scenario-tests-cross-language) for the canonical step-by-step.
 
+    @_SKIP_IF_CROSS_SUB_CLIENTS_OLD
     @RandomNameResourceGroupPreparer(location=WCUS_LOCATION)
     @recorded_by_proxy
     def test_start_c2c_job_with_private_source(self, resource_group, **kwargs):