[Config] Remove diffusion_batch_size and use max_num_seqs instead. (#6484)

Signed-off-by: LyxWxj <yuxuanlou621@foxmail.com>
Signed-off-by: Yuxuan Rho <104440472+LyxWxj@users.noreply.github.com>
Co-authored-by: Hongsheng Liu <liuhongsheng4@huawei.com>

tests/diffusion/test_multiproc_engine_concurrency.py

@@ -1171,7 +1171,6 @@ class TestStageDiffusionClientErrorPropagation:
                 metadata,
                 "tcp://req",
                 "tcp://resp",
-                batch_size=1,
             )
 
     @pytest.mark.asyncio