api: GetPullRequestCommits: return file list (#27483) (#27539)
Backport #27483 by @msantos
Fixes https://github.com/go-gitea/gitea/issues/27481
---
Patch tested:
```json
[
{
"url": "7664dcb441",
"sha": "7664dcb44167e0f9efd994e4ca6a9164694adc27",
"created": "2023-10-06T09:57:08-04:00",
"html_url": "7664dcb441",
...
"files": [
{
"filename": "README.md",
"status": "modified"
}
],
"stats": {
"total": 2,
"additions": 2,
"deletions": 0
}
}
]
```
Co-authored-by: Michael Santos <michael.santos@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
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