Add context.Context to more methods (#21546)

This PR adds a context parameter to a bunch of methods. Some helper
`xxxCtx()` methods got replaced with the normal name now.

Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

services/task/migrate.go

@@ -51,7 +51,7 @@ func runMigrateTask(t *admin_model.Task) (err error) {
 		if err == nil {
 			err = admin_model.FinishMigrateTask(t)
 			if err == nil {
-				notification.NotifyMigrateRepository(t.Doer, t.Owner, t.Repo)
+				notification.NotifyMigrateRepository(db.DefaultContext, t.Doer, t.Owner, t.Repo)
 				return
 			}