fix: use the original name when uploading the attachment to upyun oss

[braverayy]

What type of PR is this?

/kind improvement
/area core

What this PR does / why we need it:

problem：
附件存储类型选择又拍云时，上传到又拍云的文件名被重命名为原图片名的MD5值。

resolve：
参考 #1500，通过 FilePathDescriptor 来构建 fullPath，relativePath 等

Which issue(s) this PR fixes:

Fixes #2181

Does this PR introduce a user-facing change?

重构又拍云附件上传文件命名规则为保持原文件名

[CLAassistant]

All committers have signed the CLA.

[guqing]

经测试功能正常
/approve

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guqing

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[guqing]

hi @okayhu, 由于是第一次贡献，你需要签署一下开源协议
#2185 (comment)
点击这条评论中的 badge 即可签署

[guqing]

/milestone 1.5.x

[ruibaby]

/lgtm
/milestone 1.5.x

[guqing]

/cherry-pick release-1.5

[halo-dev-bot]

@guqing: once the present PR merges, I will cherry-pick it on top of release-1.5 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.5

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[halo-dev-bot]

@guqing: new pull request created: #2186

In response to this:

/cherry-pick release-1.5

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[guqing]

Congrats on merging your first pull request! 🎉🎉🎉