### What this PR does / why we need it?
1. add `COMPILATION_PASS_KEY` constant
2. clean up useless platform interface `empty_cache`, `synchronize`,
`mem_get_info`, `clear_npu_memory`
3. rename `CUSTOM_OP_REGISTERED` to `_CUSTOM_OP_REGISTERED`
4. remove uesless env `VLLM_ENABLE_CUDAGRAPH_GC`
NPUPlatform is the interface called by vLLM. Do not call it inner
vllm-ascend.
### Does this PR introduce _any_ user-facing change?
This PR is just a cleanup. All CI should pass.
### How was this patch tested?
- vLLM version: v0.13.0
- vLLM main:
7157596103
Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>
What this PR does / why we need it?
test device allocator/camem and mutistream/layers contains resource
allocation and stream ops
Does this PR introduce any user-facing change?
N/A
How was this patch tested?
CI passed with new added test.
- vLLM version: v0.10.0
- vLLM main:
2836dd73f1
Signed-off-by: 1024daniel <xxltju324@gmail.com>
