Fix schedule tasks bugs (#28691)

Fix #28157

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.

(cherry picked from commit 97292da960)

Conflicts:
	modules/actions/github.go
	routers/web/repo/setting/default_branch.go
	routers/web/repo/setting/setting.go
	services/repository/branch.go
	services/repository/setting.go
	tests/integration/actions_trigger_test.go

modules/actions/github.go

@@ -22,6 +22,7 @@ const (
 	GithubEventRelease                  = "release"
 	GithubEventPullRequestComment       = "pull_request_comment"
 	GithubEventGollum                   = "gollum"
+	GithubEventSchedule                 = "schedule"
 )
 
 // IsDefaultBranchWorkflow returns true if the event only triggers workflows on the default branch
@@ -115,6 +116,9 @@ func canGithubEventMatch(eventName string, triggedEvent webhook_module.HookEvent
 		return triggedEvent == webhook_module.HookEventIssueComment ||
 			triggedEvent == webhook_module.HookEventPullRequestComment
 
+	case GithubEventSchedule:
+		return triggedEvent == webhook_module.HookEventSchedule
+
 	default:
 		return eventName == string(triggedEvent)
 	}