Disable the forward-to-socks-proxy and forward-to-http-proxy scenarios for now

Since curl commit d39db811929f the port randomisation can no
longer be disabled by the injected module so the tests don't
work at the moment.

Discussion on the curl library mailinglist didn't result in
a solution [0].

[0]: https://curl.se/mail/lib-2025-08/0000.html

diff --git a/tests/cts/forward-to-http-proxy/privoxy.conf b/tests/cts/forward-to-http-proxy/privoxy.conf.disabled
similarity index 100%
rename from tests/cts/forward-to-http-proxy/privoxy.conf
rename to tests/cts/forward-to-http-proxy/privoxy.conf.disabled

diff --git a/tests/cts/forward-to-socks-proxy/privoxy.conf b/tests/cts/forward-to-socks-proxy/privoxy.conf.disabled
similarity index 100%
rename from tests/cts/forward-to-socks-proxy/privoxy.conf
rename to tests/cts/forward-to-socks-proxy/privoxy.conf.disabled