…lient (Azure#44999)

- Pass **kwargs from __init__ to _build_pipeline() in both sync and async
  ServiceBusAdministrationClient so transport kwargs (connection_verify,
  transport, policies, ssl_context) reach the transport layer
- Add unit tests verifying kwargs forwarding for both sync and async clients
- Matches pattern from Azure#26015 fix for ServiceBusClient and azure-core base

- mgmt_handlers.list_sessions_op: gate the empty-list 404 response on the com.microsoft:message-not-found condition so other 404s (entity not found, auth failures) propagate as errors instead of being silently swallowed.

- _session_browser / _session_browser_async: normalize naive updated_since datetimes to UTC so the wire timestamp is independent of the host timezone (matches how naive datetimes are treated elsewhere in the SDK).

- _session_browser / _session_browser_async: build _auth_uri from the full entity path (including /Subscriptions/<sub>) so SAS auth resolves correctly when listing subscription sessions.

- _session_browser / _session_browser_async: remove unused imports (logging/_LOGGER, BaseHandler in async, Any/Union, _MAX_DATETIME, _amqp_timestamp_value).

- _servicebus_client.list_queue_sessions / list_subscription_sessions: drop the forward-reference quotes around datetime so the import is actually used (matches the async client style).

- tests/test_list_sessions.py: remove the unused _logger setup and its logging/get_logger imports.

Add 'timeout > 0' validation to ServiceBusClient.list_queue_sessions, list_subscription_sessions and their async counterparts. Matches the existing validation pattern used by sender/receiver/session operations across the SDK.

- Add 'pylint:disable=do-not-import-asyncio' on the asyncio import in _session_browser_async.py to match every other async module in this package.

- Use str keys ('last-updated-time', 'skip', 'top') in the get-message-sessions request body to match the dict[str, Any] signature of _mgmt_request_response_with_retry, fixing two new mypy errors. The pyamqp mgmt layer encodes string keys to bytes on the wire, so behavior is unchanged.

…ests

- tests/test_list_sessions.py: add list_subscription_sessions empty + updated_since coverage so the topic/subscription entity path is exercised in both wire modes.

- tests/async_tests/test_list_sessions_async.py: new module covering the _SessionBrowserAsync path (sync parity: queue + subscription, active / empty / updated_since).

All four updated_since live tests (sync + async, queue + subscription) now use 'datetime.now(timezone.utc) - timedelta(minutes=1)' as the boundary so client/server clock skew can't push the freshly-sent session past the cutoff and cause flakes.

Replace the legacy '# type:' return comment with explicit '-> List[str]' annotations on list_queue_sessions and list_subscription_sessions in both the sync and async ServiceBusClient. Matches other modern public APIs and surfaces the return type to type checkers and IDE tooling.

The previous docstring said 'sessions whose state was updated' which only matches the user-set state via SetState. The wire-level get-message-sessions operation actually returns sessions whose last update (state change OR message activity) is after the cutoff. Updated the docstrings on the four public methods and on the internal _SessionBrowser/_SessionBrowserAsync.list_sessions to reflect the actual behavior.

_SessionBrowserAsync calls self._amqp_transport.create_mgmt_client_async(...) but the uamqp async transport never exposed it, so list_queue_sessions / list_subscription_sessions on the async client would AttributeError when uamqp_transport=True. Added the factory mirroring the sync UamqpTransport.create_mgmt_client implementation.

- _pyamqp_transport.py: correct the create_mgmt_client docstring to reference azure.servicebus._common._configuration.Configuration (the configuration class lives in the _common subpackage; the previous path was wrong and broke Sphinx cross-references).

- tests/test_list_sessions.py and tests/async_tests/test_list_sessions_async.py: reorder imports so stdlib (uuid, datetime) comes before third-party (pytest), matching pylint expectations and the rest of the test suite.

- _create_session_browser (sync + async): expand stub docstring with params, return, and rtype to satisfy docstring-missing-* checks.

- create_mgmt_client / create_mgmt_client_async (4 transport variants): add docstring-keyword-should-match-keyword-only disable, mirroring the existing pattern on create_send_client where the keyword-only args are passed through **kwargs.

- _transport/_uamqp_transport.py: hoist 'AMQPClient' to the module-level uamqp import block so create_mgmt_client doesn't trip used-before-assignment.

- _transport/_pyamqp_transport.py: drop the redundant TYPE_CHECKING-only import of AMQPClient (already imported at module level for runtime use).

- aio/_transport/_pyamqp_transport_async.py: import AMQPClientAsync directly from ..._pyamqp.aio (it's exported there) instead of the aliased _client_async import; remove the redundant TYPE_CHECKING import; use AMQPClientAsync uniformly.

- aio/_servicebus_client_async.py: extend the existing client-method-missing-tracing-decorator disable to cover the -async variant (matches the sync-side disable already in this module).