fix(s2n-quic-dc): wait to insert in peer map until handshake completes #4961

Job	Run time
env	6s
s2n-quic-qns (debug)	2m 26s
s2n-quic-qns (release)	6m 33s
perf (s2n-quic, s2n-quic)	1m 27s
perf (s2n-quic-null, s2n-quic-null)	1m 5s
attack (udp)	5m 33s
bench	18m 6s
interop (aioquic, s2n-quic)	17m 6s
h3spec (s2n-tls)	15s
interop (chrome, s2n-quic)	5m 29s
h3spec (rustls)	14s
interop (go-x-net, s2n-quic)	12m 5s
interop (kwik, s2n-quic)	14m 1s
interop (lsquic, s2n-quic)	13m 2s
interop (msquic, s2n-quic)	16m 45s
interop (mvfst, s2n-quic)	11m 34s
interop (neqo, s2n-quic)	15m 14s
interop (ngtcp2, s2n-quic)	14m 33s
interop (picoquic, s2n-quic)	15m 48s
interop (quic-go, s2n-quic)	12m 54s
interop (quiche, s2n-quic)	17m 59s
interop (quinn, s2n-quic)	14m 11s
interop (s2n-quic, aioquic)	13m 4s
interop (s2n-quic, go-x-net)	11m 15s
interop (s2n-quic, haproxy)	15m 37s
interop (s2n-quic, kwik)	12m 12s
interop (s2n-quic, lsquic)	11m 56s
interop (s2n-quic, msquic)	12m 47s
interop (s2n-quic, mvfst)	14m 54s
interop (s2n-quic, neqo)	12m 35s
interop (s2n-quic, nginx)	11m 1s
interop (s2n-quic, ngtcp2)	12m 56s
interop (s2n-quic, picoquic)	11m 57s
interop (s2n-quic, quic-go)	10m 48s
interop (s2n-quic, quiche)	11m 47s
interop (s2n-quic, quinn)	12m 43s
interop (s2n-quic, s2n-quic)	11m 52s
interop (s2n-quic, s2n-quic-rustls)	13m 51s
interop (s2n-quic, xquic)	5m 32s
interop (s2n-quic-rustls, s2n-quic)	12m 20s
interop (xquic, s2n-quic)	8m 48s
perf-report	17s
interop-report	18s
	7h 24m 56s

Provide feedback