[CI] Add DeepSeek-V3.2 large EP nightly ci (#6378)

### What this PR does / why we need it?

Add DeepSeek-V3.2 nightly ci

Fix PD routing to exclude headless nodes when collecting
prefiller/decoder IPs

- vLLM version: v0.14.1
- vLLM main:
dc917cceb8

Signed-off-by: hfadzxy <starmoon_zhang@163.com>

tests/e2e/nightly/multi_node/scripts/multi_node_config.py

@@ -136,8 +136,8 @@ class ProxyLauncher:
         if not self.is_master or self.cfg is None:
             logger.info("Not launching proxy on non-master node")
             return self
-        prefiller_ips = [self.nodes[i].ip for i in self.cfg.prefiller_indices]
-        decoder_ips = [self.nodes[i].ip for i in self.cfg.decoder_indices]
+        prefiller_ips = [self.nodes[i].ip for i in self.cfg.prefiller_indices if not self.nodes[i].headless]
+        decoder_ips = [self.nodes[i].ip for i in self.cfg.decoder_indices if not self.nodes[i].headless]
 
         cmd = [
             "python",