feat(s2n-quic-dc): update MTU on dc path when MTU is updated #4890

Job	Run time
env	7s
s2n-quic-qns (debug)	2m 29s
s2n-quic-qns (release)	7m 11s
h3spec (s2n-tls)	13s
bench	18m 3s
h3spec (rustls)	18s
perf (s2n-quic, s2n-quic)	1m 13s
perf (s2n-quic-null, s2n-quic-null)	53s
attack (udp)	5m 30s
interop (aioquic, s2n-quic)	16m 36s
interop (chrome, s2n-quic)	5m 9s
interop (go-x-net, s2n-quic)	11m 44s
interop (kwik, s2n-quic)	14m 37s
interop (lsquic, s2n-quic)	12m 45s
interop (msquic, s2n-quic)	16m 9s
interop (mvfst, s2n-quic)	11m 20s
interop (neqo, s2n-quic)	14m 56s
interop (ngtcp2, s2n-quic)	14m 11s
interop (picoquic, s2n-quic)	14m 48s
interop (quic-go, s2n-quic)	12m 30s
interop (quiche, s2n-quic)	19m 7s
interop (quinn, s2n-quic)	13m 24s
interop (s2n-quic, aioquic)	14m 12s
interop (s2n-quic, go-x-net)	11m 14s
interop (s2n-quic, haproxy)	12m 2s
interop (s2n-quic, kwik)	12m 12s
interop (s2n-quic, lsquic)	11m 6s
interop (s2n-quic, msquic)	12m 49s
interop (s2n-quic, mvfst)	13m 52s
interop (s2n-quic, neqo)	12m 48s
interop (s2n-quic, nginx)	11m 18s
interop (s2n-quic, ngtcp2)	12m 58s
interop (s2n-quic, picoquic)	11m 33s
interop (s2n-quic, quic-go)	10m 50s
interop (s2n-quic, quiche)	10m 43s
interop (s2n-quic, quinn)	11m 49s
interop (s2n-quic, s2n-quic)	11m 58s
interop (s2n-quic, s2n-quic-rustls)	12m 21s
interop (s2n-quic, xquic)	11m 58s
interop (s2n-quic-rustls, s2n-quic)	12m 2s
interop (xquic, s2n-quic)	16m 37s
perf-report	10s
interop-report	20s
	7h 28m 5s

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