[Refactor] delete stream sync · Pull Request !1343 · MindSpore/vllm-mindspore

1. delete stream sync

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**What type of PR is this?**

/kind refactor

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**What does this PR do / why do we need it**:

在此行填写本 PR 的概要（中/英均可）。Please write the summary here.

删除流同步操作，改分支配套ms已经修复多流下发场景下的event时序问题，可删除手动流同步操作。

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**Which issue(s) this PR fixes**:

Fixes #IDAT6A

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**Test Plan and Test result：What scenarios were tested, and what were the verification results（Function, performance, reliability, etc.）**：

在此行填写测试计划与结果要点（可用清单列出）。Please list the test plan and results here.

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