[ci] fix: release ascend test time, fix one step off-policy CI (#2731)

### What does this PR do?

release ascend test time, recent PRs got cancelled but operation
successfully, fix one step off-policy CI.

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Author: ETOgaosion

.github/workflows/e2e_ascend.yml

@@ -72,7 +72,7 @@ jobs:
   test:
     name: verl Ascend test (self-host)
     runs-on: [self-hosted, npu-0]
-    timeout-minutes: 30 # Increase this timeout value as needed
+    timeout-minutes: 40 # Increase this timeout value as needed
     container:
       image: crispig/verl_npu:cann8.1rc1-py3.10-torch2.5.1-vllm-ascend0.7.3.post1-250616
       volumes:

tests/special_e2e/run_one_step_off_policy.sh

@@ -73,7 +73,6 @@ common_params=(
     actor_rollout_ref.actor.clip_ratio_high=${clip_ratio_high}
     actor_rollout_ref.actor.clip_ratio_c=10.0
     actor_rollout_ref.model.path="${MODEL_PATH}"
-    actor_rollout_ref.model.enable_gradient_checkpointing=True
     actor_rollout_ref.actor.optim.lr=1e-6
     actor_rollout_ref.actor.optim.lr_warmup_steps=-1
     actor_rollout_ref.actor.optim.weight_decay=0.1
@@ -127,6 +126,7 @@ if [ "${ACTOR_STRATEGY}" == "fsdp2" ]; then
         critic.strategy=fsdp2 \
         actor_rollout_ref.actor.grad_clip=1.0 \
         actor_rollout_ref.model.use_remove_padding=True \
+        actor_rollout_ref.model.enable_gradient_checkpointing=True \
         actor_rollout_ref.actor.use_dynamic_bsz=True \
         actor_rollout_ref.ref.log_prob_use_dynamic_bsz=True \
         actor_rollout_ref.rollout.log_prob_use_dynamic_bsz=True \