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### What this PR does / why we need it? Make CANN version bump separately from https://github.com/vllm-project/vllm-ascend/pull/708 - Upgrade CANN version to 8.1.rc1 - Add prefix to speed up download `m.daocloud.io/quay.io/ascend/cann:8.1.rc1-910b-ubuntu22.04-py3.10` - Address tail sapce for Dockerfile.openEuler - Add note for `/workspace` and `/vllm-workspace` as followup of https://github.com/vllm-project/vllm-ascend/pull/741 ### Does this PR introduce _any_ user-facing change? no ### How was this patch tested? CI passed Co-authored-by: MengqingCao <cmq0113@163.com> Signed-off-by: Yikun Jiang <yikunkero@gmail.com> Co-authored-by: MengqingCao <cmq0113@163.com>