MINOR: ocsp: Raise specific ocsp error code in ocsp parsing/verifying functions

MINOR: ocsp: Raise specific ocsp error code in ocsp parsing/verifying functions

Instead of relying purely on error messages, the ssl_ocsp_check_response
and ssl_sock_update_ocsp_response functions can now return custom error
codes.
They were loosely based on the new verify error codes introduced in
newer version of OpenSSL (3.6.2 for instance) but needed to be
duplicated rather than used directly because of compatibility issues
with various SSL libraries.