### What this PR does / why we need it?
1. Refactor image workflow using cache-from to speedup builds

Simultaneously refactored all Dockerfiles by placing layers that rarely
change before those that change frequently, improving build cache hit
rate.
2. Refactor E2E test using vllm-ascend container images, to skip C
compile while no C code are changed

In this case, the job will only replace the source code of vllm-ascend
and install `requirements-dev.txt`, saving about 10min before tests
### Does this PR introduce _any_ user-facing change?
### How was this patch tested?
- vLLM version: v0.15.0
- vLLM main:
9562912cea
Signed-off-by: wjunLu <wjunlu217@gmail.com>