Display total commit count in hook message (#21400)

Fixes #21379

The commits are capped by `setting.UI.FeedMaxCommitNum` so
`len(commits)` is not the correct number. So this PR adds a new
`TotalCommits` field.

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

services/webhook/wechatwork.go

@@ -93,7 +93,7 @@ func (f *WechatworkPayload) Push(p *api.PushPayload) (api.Payloader, error) {
 	for i, commit := range p.Commits {
 		var authorName string
 		if commit.Author != nil {
-			authorName = "Author：" + commit.Author.Name
+			authorName = "Author: " + commit.Author.Name
 		}
 
 		message := strings.ReplaceAll(commit.Message, "\n\n", "\r\n")