fix saved tensor leaf node requires_grad · Pull Request !90549 · MindSpore/mindspore

1. fix saved tensor leaf node requires_grad
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**What type of PR is this?**

/kind bug

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**What does this PR do / why do we need it**:
1.event_py 恢复成同步析构。当event_py python对象不在主线程析构时，给frontend线程下发任务会引发错误。
2.为 saved tensor 添加 requires_grad 属性，修复在启用 saved_tensors_hooks 时 为叶子节点的saved_tensor的requires_grad 设置不正确的问题。
3.修改文档格式和内容，与r2.7.2分支一致。

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

Fixes #ICVKMT

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**Test Plan and Test result：What scenarios were tested, and what were the verification results（Function, performance, reliability, etc.）**：
针对第二点添加冒烟用例test_saved_tensors_hooks_with_high_grad。测试在saved_tensors_hooks作用时，高阶微分计算出的导数是否正确。间接证明saved_tensor的requires_grad是否设置正确。

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+ - [x] **设计**：PR对应的方案是否已经经过Maintainer评审，方案检视意见是否均已答复并完成方案修改
+ - [x] **测试**：PR中的代码是否已有UT/ST测试用例进行充分的覆盖，新增测试用例是否随本PR一并上库或已经上库
+ - [x] **验证**：PR描述信息中是否已包含对该PR对应的Feature、Refactor、Bugfix的预期目标达成情况的详细验证结果描述
+ - [ ] **接口**：是否涉及对外接口变更，相应变更已得到接口评审组织的通过，API对应的注释信息已经刷新正确
+ - [ ] **文档**：是否涉及官网文档修改，如果涉及请及时提交资料到Doc仓

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