Remove QuerySnapshotReadWrite from retry_tx_normal tests (server doesn't support writes in snapshot isolation)

Co-authored-by: vgvoleg <[email protected]>

Author: Copilot

tests/aio/query/test_query_session_pool.py

@@ -69,7 +69,6 @@ async def callee(session: QuerySession):
             (None),
             (ydb.QuerySerializableReadWrite()),
             (ydb.QuerySnapshotReadOnly()),
-            (ydb.QuerySnapshotReadWrite()),
             (ydb.QueryOnlineReadOnly()),
             (ydb.QueryStaleReadOnly()),
         ],

tests/query/test_query_session_pool.py

@@ -68,7 +68,6 @@ def callee(session: QuerySession):
             (None),
             (ydb.QuerySerializableReadWrite()),
             (ydb.QuerySnapshotReadOnly()),
-            (ydb.QuerySnapshotReadWrite()),
             (ydb.QueryOnlineReadOnly()),
             (ydb.QueryStaleReadOnly()),
         ],