fix: add parsing check in TLS compress_certificate extension handler

fix: add parsing check in TLS compress_certificate extension handler

The tls_parse_compress_certificate function was missing validation
for trailing bytes after parsing the algorithm list, violating
RFC8446 section 4.2 which requires sending a decode_error alert
for unparseable messages.

This commit adds a check for remaining bytes in the packet after
the while loop and sends SSL_AD_DECODE_ERROR if any trailing
bytes are found.

Fixes #27717

CLA: trivial

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/27733)

(cherry picked from commit 8e787b102848e462a6d231883e2c42d91978c049)