Fix record layer leak when swapping chained transport BIO

Fix record layer leak when swapping chained transport BIO

tls_set1_bio() freed only the top BIO (BIO_free). Use BIO_free_all so
a pushed transport chain is released when the record layer replaces
its BIO.

Add test_ssl_set_wbio_chain_no_leak in sslapitest (stacked BIO chain
via SSL_set0_wbio) per reviewer feedback on GH openssl#30483. Drop the
Perl s_client reconnect recipe and CHANGES entry (internal leak only).

Fixes #30458

Reviewed-by: Simo Sorce <simo@redhat.com>
Reviewed-by: Matt Caswell <matt@openssl.foundation>
MergeDate: Tue Apr 28 06:39:25 2026
(Merged from https://github.com/openssl/openssl/pull/30483)