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>

models/issues/pull_list.go

@@ -79,7 +79,7 @@ func CanMaintainerWriteToBranch(p access_model.Permission, branch string, user *
 
 	for _, pr := range prs {
 		if pr.AllowMaintainerEdit {
-			err = pr.LoadBaseRepo()
+			err = pr.LoadBaseRepo(db.DefaultContext)
 			if err != nil {
 				continue
 			}