[Deprecation] Remove deprecated task, seed and MM settings (#30397)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

examples/offline_inference/vision_language_multi_image.py

@@ -1382,7 +1382,7 @@ def run_generate(
     model,
     question: str,
     image_urls: list[str],
-    seed: int | None,
+    seed: int,
     tensor_parallel_size: int | None,
 ):
     req_data = model_example_map[model](question, image_urls)
@@ -1416,7 +1416,7 @@ def run_chat(
     model: str,
     question: str,
     image_urls: list[str],
-    seed: int | None,
+    seed: int,
     tensor_parallel_size: int | None,
 ):
     req_data = model_example_map[model](question, image_urls)
@@ -1494,7 +1494,7 @@ def parse_args():
     parser.add_argument(
         "--seed",
         type=int,
-        default=None,
+        default=0,
         help="Set the seed when initializing `vllm.LLM`.",
     )
     parser.add_argument(