[Misc][V0 Deprecation] Remove Redundant Offline Distributed Inference Example (#1899)

### What this PR does / why we need it?
The file `offline_distributed_inference_npu.py` is the same as
`offline_inference_npu_tp2.py`, thus we delete one of them.

This PR is a part of
#1620.

### Does this PR introduce _any_ user-facing change?

### How was this patch tested?


- vLLM version: v0.9.2
- vLLM main:
vllm-project/vllm@8188196

Signed-off-by: shen-shanshan <467638484@qq.com>

Author: shen-shanshan