format with gofumpt (#18184)

* gofumpt -w -l .

* gofumpt -w -l -extra .

* Add linter

* manual fix

* change make fmt

services/mailer/mail_issue.go

@@ -40,7 +40,6 @@ const (
 // 1. Repository watchers (except for WIP pull requests) and users who are participated in comments.
 // 2. Users who are not in 1. but get mentioned in current issue/comment.
 func mailIssueCommentToParticipants(ctx *mailCommentContext, mentions []*user_model.User) error {
-
 	// Required by the mail composer; make sure to load these before calling the async function
 	if err := ctx.Issue.LoadRepo(); err != nil {
 		return fmt.Errorf("LoadRepo(): %v", err)