Rework delete org and rename org UI (#34762)

# What's the problem of the original implementation

Renaming organization will mix with organization's information change
make the operation difficult to keep consistent.

This PR created a danger zone like what's repository setting. It also
moved organization's `rename` and `delete` operations to this zone. The
original updating repository will not change the name any more.

This is also a step to extract the `updaterepository` function
completely.

Before:


![image](https://github.com/user-attachments/assets/d097dfdf-07be-4d79-8fcf-e78822515575)

![image](https://github.com/user-attachments/assets/42ee832c-cb44-41ec-9fe3-92a1c94747d2)

After:


![image](https://github.com/user-attachments/assets/f7700ed7-f104-4302-a924-09e118f24be3)

![image](https://github.com/user-attachments/assets/4c49952a-578e-4d14-bd01-4a68c9e02412)

![image](https://github.com/user-attachments/assets/814829d3-00fe-4e87-ae05-625c129170d2)

![image](https://github.com/user-attachments/assets/b067b263-c909-4b48-b23c-73481c32d350)

---------

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

routers/web/web.go

@@ -964,7 +964,8 @@ func registerWebRoutes(m *web.Router) {
 					addSettingsVariablesRoutes()
 				}, actions.MustEnableActions)
 
-				m.Methods("GET,POST", "/delete", org.SettingsDelete)
+				m.Post("/rename", web.Bind(forms.RenameOrgForm{}), org.SettingsRenamePost)
+				m.Post("/delete", org.SettingsDeleteOrgPost)
 
 				m.Group("/packages", func() {
 					m.Get("", org.Packages)