Add skip and limit to git.GetTags (#16897)

* Make GetTags() api similar to GetBranches()
* Use it for Tag/Release page

modules/context/repo.go

@@ -547,7 +547,7 @@ func RepoAssignment(ctx *Context) (cancel context.CancelFunc) {
 		return
 	}
 
-	tags, err := ctx.Repo.GitRepo.GetTags()
+	tags, err := ctx.Repo.GitRepo.GetTags(0, 0)
 	if err != nil {
 		ctx.ServerError("GetTags", err)
 		return