Move hq-interop code to test/quic-openssl-docker

Its the only place we use this code, so put the code in that directory

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/26546)

demos/guide/build.info

@@ -9,11 +9,9 @@ PROGRAMS{noinst} = tls-client-block \
                    quic-multi-stream \
                    tls-client-non-block \
                    quic-client-non-block \
-                   quic-hq-interop \
                    quic-server-block \
                    quic-server-non-block \
                    quic-client-non-block \
-                   quic-hq-interop-server
 
 INCLUDE[tls-client-block]=../../include
 SOURCE[tls-client-block]=tls-client-block.c
@@ -43,10 +41,3 @@ INCLUDE[quic-client-non-block]=../../include
 SOURCE[quic-client-non-block]=quic-client-non-block.c
 DEPEND[quic-client-non-block]=../../libcrypto ../../libssl
 
-INCLUDE[quic-hq-interop]=../../include
-SOURCE[quic-hq-interop]=quic-hq-interop.c
-DEPEND[quic-hq-interop]=../../libcrypto ../../libssl
-
-INCLUDE[quic-hq-interop-server]=../../include
-SOURCE[quic-hq-interop-server]=quic-hq-interop-server.c
-DEPEND[quic-hq-interop-server]=../../libcrypto ../../libssl