[bugfix] restore pr-7029 and fix patch error (#7294)

### What this PR does / why we need it?
This PR restores #7029, which adds W8A8C8 support for dsv3.2/glm5 using
the `lightning_indexer_quant` ops in the pd-mix stage.

The original PR was reverted by #7288 because the patch did not work
with the recompute scheduler.

This PR also fixes the patching issue so that it works correctly with
the recompute scheduler.

### Does this PR introduce _any_ user-facing change?
Yes. To enable LI C8, users need to set the `enable_sparse_c8` option to
`"true"` in `additional_config`.

- vLLM version: v0.17.0
- vLLM main:
4034c3d32e
---------
Signed-off-by: rjg-lyh <1318825571@qq.com>

.github/workflows/scripts/config.yaml

@@ -70,6 +70,8 @@ e2e-2card-light:
     estimated_time: 220
   - name: tests/e2e/multicard/2-cards/test_offline_inference_distributed.py::test_deepseek3_2_w8a8_pruning_mtp_tp2_ep
     estimated_time: 90
+  - name: tests/e2e/multicard/2-cards/test_offline_inference_distributed.py::test_deepseek3_2_w8a8c8_pruning_mtp_tp2_ep
+    estimated_time: 90
   - name: tests/e2e/multicard/2-cards/test_offline_inference_distributed.py::test_gpt_oss_distributed_tp2
     estimated_time: 180
 
@@ -122,6 +124,8 @@ e2e-multicard-2-cards:
     estimated_time: 71
   - name: tests/e2e/multicard/2-cards/test_offline_inference_distributed.py::test_deepseek3_2_w8a8_pruning_mtp_tp2_ep
     estimated_time: 111
+  - name: tests/e2e/multicard/2-cards/test_offline_inference_distributed.py::test_deepseek3_2_w8a8c8_pruning_mtp_tp2_ep
+    estimated_time: 111
   - name: tests/e2e/multicard/2-cards/test_offline_inference_distributed.py::test_qwen3_w4a4_distributed_tp2
     estimated_time: 180
   - name: tests/e2e/multicard/2-cards/test_pipeline_parallel.py