Fix `link-action` redirect network error (#27734) (#27749)

Backport #27734 by @lng2020

<img width="823" alt="image"
src="https://github.com/go-gitea/gitea/assets/70063547/99da3d5a-c28a-4fd0-8ae0-88461a9142e2">

Co-authored-by: Nanguan Lin <70063547+lng2020@users.noreply.github.com>
Co-authored-by: 6543 <6543@obermui.de>

routers/web/repo/milestone.go

@@ -225,14 +225,15 @@ func EditMilestonePost(ctx *context.Context) {
 
 // ChangeMilestoneStatus response for change a milestone's status
 func ChangeMilestoneStatus(ctx *context.Context) {
-	toClose := false
+	var toClose bool
 	switch ctx.Params(":action") {
 	case "open":
 		toClose = false
 	case "close":
 		toClose = true
 	default:
-		ctx.Redirect(ctx.Repo.RepoLink + "/milestones")
+		ctx.JSONRedirect(ctx.Repo.RepoLink + "/milestones")
+		return
 	}
 	id := ctx.ParamsInt64(":id")
 
@@ -244,7 +245,7 @@ func ChangeMilestoneStatus(ctx *context.Context) {
 		}
 		return
 	}
-	ctx.Redirect(ctx.Repo.RepoLink + "/milestones?state=" + url.QueryEscape(ctx.Params(":action")))
+	ctx.JSONRedirect(ctx.Repo.RepoLink + "/milestones?state=" + url.QueryEscape(ctx.Params(":action")))
 }
 
 // DeleteMilestone delete a milestone

routers/web/repo/projects.go

@@ -161,14 +161,15 @@ func NewProjectPost(ctx *context.Context) {
 
 // ChangeProjectStatus updates the status of a project between "open" and "close"
 func ChangeProjectStatus(ctx *context.Context) {
-	toClose := false
+	var toClose bool
 	switch ctx.Params(":action") {
 	case "open":
 		toClose = false
 	case "close":
 		toClose = true
 	default:
-		ctx.Redirect(ctx.Repo.RepoLink + "/projects")
+		ctx.JSONRedirect(ctx.Repo.RepoLink + "/projects")
+		return
 	}
 	id := ctx.ParamsInt64(":id")
 
@@ -180,7 +181,7 @@ func ChangeProjectStatus(ctx *context.Context) {
 		}
 		return
 	}
-	ctx.Redirect(ctx.Repo.RepoLink + "/projects?state=" + url.QueryEscape(ctx.Params(":action")))
+	ctx.JSONRedirect(ctx.Repo.RepoLink + "/projects?state=" + url.QueryEscape(ctx.Params(":action")))
 }
 
 // DeleteProject delete a project