tests: xfail LWT tests on Scylla versions without tablet LWT support

LWT is not supported with tablets on ScyllaDB < 2025.4. Mark the affected SerialConsistencyTests and
LightweightTransactionTests as xfail for those versions.

Author: sylwiaszunejko

tests/integration/standard/test_query.py

@@ -26,7 +26,7 @@
 from cassandra.policies import HostDistance, RoundRobinPolicy, WhiteListRoundRobinPolicy
 from tests.integration import use_singledc, PROTOCOL_VERSION, BasicSharedKeyspaceUnitTestCase, \
     greaterthanprotocolv3, MockLoggingHandler, get_supported_protocol_versions, local, get_cluster, setup_keyspace, \
-    USE_CASS_EXTERNAL, greaterthanorequalcass40, TestCluster, xfail_scylla
+    USE_CASS_EXTERNAL, greaterthanorequalcass40, TestCluster, xfail_scylla, xfail_scylla_version_lt
 from tests import notwindows
 from tests.integration import greaterthanorequalcass30, get_node
 from tests.util import assertListEqual, wait_until
@@ -804,6 +804,9 @@ def setUp(self):
     def tearDown(self):
         self.cluster.shutdown()
 
+    @xfail_scylla_version_lt(reason='scylladb/scylladb#18068 - LWT is not yet supported with tablets',
+                             scylla_version='2025.4',
+                             raises=InvalidRequest)
     def test_conditional_update(self):
         self.session.execute("INSERT INTO test3rf.test (k, v) VALUES (0, 0)")
         statement = SimpleStatement(
@@ -828,6 +831,9 @@ def test_conditional_update(self):
         assert result
         assert result.one().applied
 
+    @xfail_scylla_version_lt(reason='scylladb/scylladb#18068 - LWT is not yet supported with tablets',
+                             scylla_version='2025.4',
+                             raises=InvalidRequest)
     def test_conditional_update_with_prepared_statements(self):
         self.session.execute("INSERT INTO test3rf.test (k, v) VALUES (0, 0)")
         statement = self.session.prepare(
@@ -850,6 +856,9 @@ def test_conditional_update_with_prepared_statements(self):
         assert result
         assert result.one().applied
 
+    @xfail_scylla_version_lt(reason='scylladb/scylladb#18068 - LWT is not yet supported with tablets',
+                             scylla_version='2025.4',
+                             raises=InvalidRequest)
     def test_conditional_update_with_batch_statements(self):
         self.session.execute("INSERT INTO test3rf.test (k, v) VALUES (0, 0)")
         statement = BatchStatement(serial_consistency_level=ConsistencyLevel.SERIAL)
@@ -915,6 +924,9 @@ def tearDown(self):
         self.session.execute("DROP TABLE test3rf.lwt_clustering")
         self.cluster.shutdown()
 
+    @xfail_scylla_version_lt(reason='scylladb/scylladb#18068 - LWT is not yet supported with tablets',
+                             scylla_version='2025.4',
+                             raises=AttributeError)
     def test_no_connection_refused_on_timeout(self):
         """
         Test for PYTHON-91 "Connection closed after LWT timeout"