feat(s2n-quic-events): add search_completed boolean to mtu updated event #4839

Job	Run time
env	4s
s2n-quic-qns (debug)	2m 37s
s2n-quic-qns (release)	7m 28s
h3spec (s2n-tls)	20s
bench	18m 39s
attack (udp)	5m 33s
h3spec (rustls)	14s
interop (aioquic, s2n-quic)	15m 49s
perf (s2n-quic, s2n-quic)	1m 25s
interop (chrome, s2n-quic)	5m 8s
perf (s2n-quic-null, s2n-quic-null)	1m 18s
interop (go-x-net, s2n-quic)	11m 46s
interop (kwik, s2n-quic)	13m 36s
interop (lsquic, s2n-quic)	14m 40s
interop (msquic, s2n-quic)	17m 29s
interop (mvfst, s2n-quic)	11m 10s
interop (neqo, s2n-quic)	16m 19s
interop (ngtcp2, s2n-quic)	14m 19s
interop (picoquic, s2n-quic)	16m 5s
interop (quic-go, s2n-quic)	12m 27s
interop (quiche, s2n-quic)	19m 19s
interop (quinn, s2n-quic)	13m 51s
interop (s2n-quic, aioquic)	13m 37s
interop (s2n-quic, go-x-net)	11m 3s
interop (s2n-quic, haproxy)	11m 48s
interop (s2n-quic, kwik)	12m 5s
interop (s2n-quic, lsquic)	11m 5s
interop (s2n-quic, msquic)	12m 3s
interop (s2n-quic, mvfst)	10m 24s
interop (s2n-quic, neqo)	12m 21s
interop (s2n-quic, nginx)	10m 58s
interop (s2n-quic, ngtcp2)	12m 52s
interop (s2n-quic, picoquic)	11m 32s
interop (s2n-quic, quic-go)	10m 38s
interop (s2n-quic, quiche)	10m 41s
interop (s2n-quic, quinn)	12m 11s
interop (s2n-quic, s2n-quic)	11m 57s
interop (s2n-quic, s2n-quic-rustls)	12m 14s
interop (s2n-quic, xquic)	12m 14s
interop (s2n-quic-rustls, s2n-quic)	12m 4s
interop (xquic, s2n-quic)	17m 12s
perf-report	14s
interop-report	38s
	7h 29m 27s

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