Improve job commit description (#30579) (#30709)
Backport #30579 by @yp05327
Fix https://github.com/go-gitea/gitea/issues/30567
When job is a schedule:
![image](https://github.com/go-gitea/gitea/assets/
18380374/
b07e9d43-e8b7-4ee2-87b3-
a7050c3a8ca5)
When it is a normal one:
![image](https://github.com/go-gitea/gitea/assets/
18380374/
0d58dab9-74bb-421b-8952-
0578cdf21a52)
also add a 'space' behind `:`
![image](https://github.com/go-gitea/gitea/assets/
18380374/
4cebece0-bfe6-4ad9-b806-
e5c49bb9be43)
![image](https://github.com/go-gitea/gitea/assets/
18380374/
02da7681-474b-4c0f-9dad-
b6558f6cb484)
Co-authored-by: yp05327 <576951401@qq.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>