MINOR: h3/hq_interop: implement stream reset on shut abort/kill-conn

MINOR: h3/hq_interop: implement stream reset on shut abort/kill-conn

Adjust QUIC mux stream shut procedure when abort or kill-conn is
performed. Changes are implemented directly into lclose callback for
h3/h09 protocols.

On abort, the stream is resetted as previously. The only change is that
now a proper error code can be used, with REQUEST_CANCELLED specified
for HTTP/3 protocol.

Kill-conn is requested when a tcp-requect connection reject rule has
been executed. In this case the stream is resetted, and the connection
is also closed. This is identical to the H2 multiplexer. HTTP/3 protocol
uses EXCESSIVE_LOAD as error code in this case.