Respect `REQUIRE_SIGNIN_VIEW` for packages (#20873)
Fix #20863
When REQUIRE_SIGNIN_VIEW = true, even with public repositories, you can only see them after you login. The packages should not be accessed without login.
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>