Replace all instances of fmt.Errorf(%v) with fmt.Errorf(%w) (#21551)

Found using
`find . -type f -name '*.go' -print -exec vim {} -c
':%s/fmt\.Errorf(\(.*\)%v\(.*\)err/fmt.Errorf(\1%w\2err/g' -c ':wq' \;`

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

models/issues/reaction.go

@@ -355,7 +355,7 @@ func (list ReactionList) LoadUsers(ctx context.Context, repo *repo_model.Reposit
 		In("id", userIDs).
 		Find(&userMaps)
 	if err != nil {
-		return nil, fmt.Errorf("find user: %v", err)
+		return nil, fmt.Errorf("find user: %w", err)
 	}
 
 	for _, reaction := range list {