Fix schedule tasks bugs (#28691) (#28780)

Fix #28157
Backport #28691 

This PR fix the possible bugs about actions schedule.

- Move `UpdateRepositoryUnit` and `SetRepoDefaultBranch` from models to
service layer
- Remove schedules plan from database and cancel waiting & running
schedules tasks in this repository when actions unit has been disabled
or global disabled.
- Remove schedules plan from database and cancel waiting & running
schedules tasks in this repository when default branch changed.

modules/actions/github.go

@@ -22,6 +22,7 @@ const (
 	GithubEventRelease                  = "release"
 	GithubEventPullRequestComment       = "pull_request_comment"
 	GithubEventGollum                   = "gollum"
+	GithubEventSchedule                 = "schedule"
 )
 
 // canGithubEventMatch check if the input Github event can match any Gitea event.
@@ -69,6 +70,9 @@ func canGithubEventMatch(eventName string, triggedEvent webhook_module.HookEvent
 			return false
 		}
 
+	case GithubEventSchedule:
+		return triggedEvent == webhook_module.HookEventSchedule
+
 	default:
 		return eventName == string(triggedEvent)
 	}