Send email on Workflow Run Success/Failure (#34982)

Closes #23725 

![1](https://github.com/user-attachments/assets/9bfa76ea-8c45-4155-a5d4-dc2f0667faa8)

![2](https://github.com/user-attachments/assets/49be7402-e5d5-486e-a1c2-8d3222540b13)

/claim #23725

---------

Signed-off-by: NorthRealm <155140859+NorthRealm@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: ChristopherHX <christopher.homberger@web.de>

routers/web/devtest/mail_preview.go

@@ -16,7 +16,7 @@ import (
 
 func MailPreviewRender(ctx *context.Context) {
 	tmplName := ctx.PathParam("*")
-	mockDataContent, err := templates.AssetFS().ReadFile("mail/" + tmplName + ".mock.yml")
+	mockDataContent, err := templates.AssetFS().ReadFile("mail/" + tmplName + ".devtest.yml")
 	mockData := map[string]any{}
 	if err == nil {
 		err = yaml.Unmarshal(mockDataContent, &mockData)