[12.x] Fix secure_url() breaking changes

[AhmedAlaa4611]

Description

This PR reverts #56684 and #56807 to resolve a breaking change introduced to the secure_url() helper.

Previously, when passing null as the path, users were able to call methods on the underlying UrlGenerator instance. After these changes, the following error occurs:

Call to a member function current() on string

Reverting ensures consistent behavior, since secure_url() should behave the same as url(), with the only difference being that it generates secure (HTTPS) URLs.