fix: skip list_tasks integration tests on servers without the endpoint

The /v1/tasks REST endpoint landed on weaviate-core's stable/v1.37 branch
on 2026-06-29, but this suite's CI-pinned Docker images for several
matrix entries predate that merge and still respond 501 "not yet
implemented". Skip rather than fail when that specific status code comes
back, so the test stays meaningful once the pinned images catch up.

Author: muhammadshayan124

integration/test_client_debug.py

@@ -8,6 +8,12 @@
 )
 from weaviate.classes.config import DataType, Property
 from weaviate.classes.debug import DebugRESTObject
+from weaviate.exceptions import UnexpectedStatusCodeError
+
+# The /v1/tasks REST endpoint landed on weaviate-core's stable/v1.37 branch on 2026-06-29
+# but isn't in every Docker image this suite's version matrix pins yet, so older builds
+# still respond 501 "not yet implemented" rather than a real payload.
+_DISTRIBUTED_TASKS_NOT_IMPLEMENTED = 501
 
 
 def test_get_object_single_node(
@@ -68,7 +74,12 @@ def test_get_object_multi_node(
 def test_list_tasks(client_factory: ClientFactory) -> None:
     client = client_factory()
 
-    tasks = client.debug.list_tasks()
+    try:
+        tasks = client.debug.list_tasks()
+    except UnexpectedStatusCodeError as e:
+        if e.status_code == _DISTRIBUTED_TASKS_NOT_IMPLEMENTED:
+            pytest.skip("distributed tasks endpoint not yet implemented on this server build")
+        raise
 
     assert isinstance(tasks, dict)
 
@@ -77,6 +88,11 @@ def test_list_tasks(client_factory: ClientFactory) -> None:
 async def test_list_tasks_async(async_client_factory: AsyncClientFactory) -> None:
     client = await async_client_factory()
 
-    tasks = await client.debug.list_tasks()
+    try:
+        tasks = await client.debug.list_tasks()
+    except UnexpectedStatusCodeError as e:
+        if e.status_code == _DISTRIBUTED_TASKS_NOT_IMPLEMENTED:
+            pytest.skip("distributed tasks endpoint not yet implemented on this server build")
+        raise
 
     assert isinstance(tasks, dict)