[MD] Release Python resources before independent process exits. · Pull Request !84134 · MindSpore/mindspore

1. Release Python resources before independent process exits.
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**What type of PR is this?**

/kind bug

**What does this PR do / why do we need it**:
解决使用独立进程模式运行两级Pipeline时，内层Pipeline无法正确释放子进程的问题。

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

Fixes #IBZ6M1

**Code review checklist [【代码检视checklist说明】](https://gitee.com/mindspore/community/blob/master/security/code_review_checklist_mechanism.md)**:

+ - [ ] 是否进行返回值校验 (禁止使用void屏蔽安全函数、自研函数返回值，C++标准库函数确认无问题可以屏蔽)
+ - [ ] 是否遵守 ***SOLID原则 / 迪米特法则***
+ - [ ] 是否具备UT测试用例看护 && 测试用例为有效用例 (若新特性无测试用例看护请说明原因)
+ - [ ] 是否为对外接口变更
+ - [ ] 是否涉及官网文档修改

类型	指派人员	状态
审查	@guozhijian 由 CODEOWNERS 文件第 28 行指派为审查者	进行中 (0/1人)
审查	tan-wei-cheng kingxian liujunzhu suteng baochong liangchenghui anyrenwei jjfeing YuJianfeng guoqi kisnwang yao_yf chenjianping yanghaitao yuchaojie limingqi107 chenweifeng changzherui zhaizhiqiang RobinGrosman Gaoxiong zhangqinghua luoyang yeyunpeng2020 徐安越 yefeng xiaotianci wujiangming	已完成 (0/0人)
测试	chentanjie zsj_mind Richard_mei Chopin_syp duanjiali wangbixing leiwei2 yushunmin FuyuanSong 邹丹音 linzhengshu lilei jihongtao sunxiyin nierong 薛宇豪朱恒超张珍珍 xiangminshan wangxingyan 杜冯泱陈盼妙 188******92 TaoLucien Ai122 dongronghua	已完成 (0/0人)

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