chore: add changes

changes/v5.0.15/fix-9781.en.md

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+Trace files were left on a node when creating a zip file for download. They are now removed when the file is sent. Also, concurrent downloads will no longer interfere with each other.

changes/v5.0.15/fix-9781.zh.md

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+当下载 日志追踪 的日志时，一些中间文件将存留在处理节点上，现在这个问题得到了修复。同时，并发下载日志将不再相互干扰。