Artifacts retention and auto clean up (#26131)

Currently, Artifact does not have an expiration and automatic cleanup
mechanism, and this feature needs to be added. It contains the following
key points:

- [x] add global artifact retention days option in config file. Default
value is 90 days.
- [x] add cron task to clean up expired artifacts. It should run once a
day.
- [x] support custom retention period from `retention-days: 5` in
`upload-artifact@v3`.
- [x] artifacts link in actions view should be non-clickable text when
expired.

custom/conf/app.example.ini

@@ -2564,6 +2564,8 @@ LEVEL = Info
 ;;
 ;; Default platform to get action plugins, `github` for `https://github.com`, `self` for the current Gitea instance.
 ;DEFAULT_ACTIONS_URL = github
+;; Default artifact retention time in days, default is 90 days
+;ARTIFACT_RETENTION_DAYS = 90
 
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