Only show newly pushed branches message in the same repository (go-gitea#26148)

Partly fixes go-gitea#26130

This is a quick fix. go-gitea#25812 will fully fix the bug.

Author: Zettat123

models/git/branch.go

@@ -394,6 +394,7 @@ func FindRecentlyPushedNewBranches(ctx context.Context, repoID, userID int64, ex
 	err := db.GetEngine(ctx).
 		Where("pusher_id=? AND is_deleted=?", userID, false).
 		And("name <> ?", excludeBranchName).
+		And("repo_id = ?", repoID).
 		And("updated_unix >= ?", time.Now().Add(-time.Hour*6).Unix()).
 		NotIn("name", subQuery).
 		OrderBy("branch.updated_unix DESC").