Add priority to protected branch (#32286)

## Solves

Currently for rules to re-order them you have to alter the creation
date. so you basicly have to delete and recreate them in the right
order. This is more than just inconvinient ...

## Solution

Add a new col for prioritization

## Demo WebUI Video

https://github.com/user-attachments/assets/92182a31-9705-4ac5-b6e3-9bb74108cbd1


---
*Sponsored by Kithara Software GmbH*

routers/api/v1/api.go

@@ -1204,6 +1204,7 @@ func Routes() *web.Router {
 						m.Patch("", bind(api.EditBranchProtectionOption{}), mustNotBeArchived, repo.EditBranchProtection)
 						m.Delete("", repo.DeleteBranchProtection)
 					})
+					m.Post("/priority", bind(api.UpdateBranchProtectionPriories{}), mustNotBeArchived, repo.UpdateBranchProtectionPriories)
 				}, reqToken(), reqAdmin())
 				m.Group("/tags", func() {
 					m.Get("", repo.ListTags)