[CI] Add Report Preview URLs Workflow

[ooooo-create]

No description provided.

[paddle-bot]

感谢你贡献飞桨文档，文档预览构建中，Docs-New 跑完后即可预览，预览链接：http://preview-pr-7524.paddle-docs-preview.paddlepaddle.org.cn/documentation/docs/zh/api/index_cn.html
预览工具的更多说明，请参考：飞桨文档预览工具

[Copilot]

Pull Request Overview

This PR adds a GitHub Actions workflow to automatically generate and post preview URLs for documentation changes in pull requests. It creates a CI system that helps reviewers easily preview documentation modifications before they are merged.

• Adds a shell script to generate preview URLs for changed documentation files
• Creates a GitHub Actions workflow that triggers on documentation changes in PRs
• Includes a minor documentation fix for Chinese API documentation formatting

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
docs/api/paddle/abs_cn.rst	Minor formatting fix changing comma to "和" in Chinese parameter type list
ci_scripts/report_preview_url.sh	Shell script to generate preview URLs for modified documentation files
.github/workflows/preview-url-report.yml	GitHub Actions workflow to automatically post preview URLs in PR comments

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[ooooo-create]

@SigureMo 一师傅，我用了两个 workflow。评论需要写权限，一个流水线的话要用 pull_request_target trigger 才行，但是感觉用这个不安全。改成了只读的得到要 comment 的内容，触发实际 comment 的流水线，但是现在另外一个被流水线触发的 workflow run 流水线的日志得去点 action 才能看见，pr 下面的 check 不会显示
我在我 fork 的仓库测试了一下好像可以（workflow_run 触发的工作流好像得合入才会跑）： ooooo-create#1 ooooo-create#2