Fix change of behavior of the single stapled OCSP response API

Fix change of behavior of the single stapled OCSP response API

Fixes #28888

Fixes b1b4b154

Instead of transferring the ownership of the single OCSP response
to the SSL object, the multi-stapling PR modified the semantics
of SSL_set_tlsext_status_ocsp_resp() to copying semantics.

This change reverts the behavior to the previous one.

Partially based on fix by Remi Gacogne:
https://github.com/openssl/openssl/pull/28894

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Saša Nedvědický <sashan@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/29251)