TLS: remove support for Secure Transport and BearSSL

These libraries do not support TLS 1.3 and have been marked for removal
for over a year. We want to help users select a TLS dependency that is
future-proof and reliable, and not supporting TLS 1.3 in 2025 does not
infer confidence. Users who build libcurl are likely to be served better
and get something more future-proof with a TLS library that supports
1.3.

Closes #16677

tests/data/test2088

@@ -26,8 +26,6 @@ MooMoo
 <features>
 SSL
 !Schannel
-!sectransp
-!bearssl
 local-http
 </features>
 <server>

tests/data/test3102

@@ -19,7 +19,6 @@ HTTP GET
 # SSL with libraries supporting CURLOPT_CERTINFO
 <features>
 SSL
-!bearssl
 !wolfssl
 </features>
 <server>

tests/data/test313

@@ -14,9 +14,7 @@ CRL
 <features>
 SSL
 local-http
-!bearssl
 !Schannel
-!sectransp
 !wolfssl
 </features>
 <server>

tests/data/test417

@@ -24,7 +24,6 @@ nomnom
 <features>
 SSL
 !wolfssl
-!bearssl
 !mbedtls
 </features>
 <server>