backport: Fix adding default Telegram webhook (#7992)

Signed-off-by: Gary Kim <gary@garykim.dev>

routers/routes/routes.go

 			m.Post("/slack/new", bindIgnErr(auth.NewSlackHookForm{}), repo.SlackHooksNewPost)
 			m.Post("/discord/new", bindIgnErr(auth.NewDiscordHookForm{}), repo.DiscordHooksNewPost)
 			m.Post("/dingtalk/new", bindIgnErr(auth.NewDingtalkHookForm{}), repo.DingtalkHooksNewPost)
+			m.Post("/telegram/new", bindIgnErr(auth.NewTelegramHookForm{}), repo.TelegramHooksNewPost)
 			m.Post("/msteams/new", bindIgnErr(auth.NewMSTeamsHookForm{}), repo.MSTeamsHooksNewPost)
 			m.Get("/:id", repo.WebHooksEdit)
 			m.Post("/gitea/:id", bindIgnErr(auth.NewWebhookForm{}), repo.WebHooksEditPost)
 			m.Post("/slack/:id", bindIgnErr(auth.NewSlackHookForm{}), repo.SlackHooksEditPost)
 			m.Post("/discord/:id", bindIgnErr(auth.NewDiscordHookForm{}), repo.DiscordHooksEditPost)
 			m.Post("/dingtalk/:id", bindIgnErr(auth.NewDingtalkHookForm{}), repo.DingtalkHooksEditPost)
+			m.Post("/telegram/:id", bindIgnErr(auth.NewTelegramHookForm{}), repo.TelegramHooksEditPost)
 			m.Post("/msteams/:id", bindIgnErr(auth.NewMSTeamsHookForm{}), repo.MSTeamsHooksNewPost)
 		})
 

templates/admin/hook_new.tmpl

 					<img class="img-13" src="{{AppSubUrl}}/img/discord.png">
 				{{else if eq .HookType "dingtalk"}}
 					<img class="img-13" src="{{AppSubUrl}}/img/dingtalk.ico">
+				{{else if eq .HookType "telegram"}}
+					<img class="img-13" src="{{AppSubUrl}}/img/telegram.png">
 				{{else if eq .HookType "msteams"}}
 					<img class="img-13" src="{{AppSubUrl}}/img/msteams.png">
 				{{end}}
 			{{template "repo/settings/webhook/slack" .}}
 			{{template "repo/settings/webhook/discord" .}}
 			{{template "repo/settings/webhook/dingtalk" .}}
+			{{template "repo/settings/webhook/telegram" .}}
 			{{template "repo/settings/webhook/msteams" .}}
 		</div>