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/pull/edits.go

@@ -23,7 +23,7 @@ func SetAllowEdits(ctx context.Context, doer *user_model.User, pr *issues_model.
 		return ErrUserHasNoPermissionForAction
 	}
 
-	if err := pr.LoadHeadRepo(); err != nil {
+	if err := pr.LoadHeadRepo(ctx); err != nil {
 		return err
 	}