Relative schema support when rewriting views field as a link

@quietone, I appreciate your patience. To clarify, a double slash represents a network-path reference, as explained in this link: RFC 3986 Section 4.2. Essentially, it should mimic the protocol of the current website URL. This is particularly useful when ensuring that links function seamlessly across both HTTP and HTTPS protocols, maintaining consistency and directing users to the same site. While Drupal typically generates links effectively, cached versions may cause issues if originally generated for HTTP but accessed via HTTPS.