Tweak DTLS-in-STUN filter benchmark filter

to allow comparing 1.3 with pqc and with/without dtls-in-stun to vanilla DTLS 1.3 (truncated output):
rtc_p2p_unittests --gtest_filter='*Bench*/*' --bench_iterations=25 --bench_server_candidates=1 --bench_pct_loss=0 | & grep RESULT | sort
(truncated)
[ dtls: server/1.2 ice: controlled pqc: 0 dtls_in_stun: 0  ]] RESULT: p10: 850 p50: 850 avg: 850 p95: 850
[ dtls: server/1.2 ice: controlled pqc: 0 dtls_in_stun: 1  ]] RESULT: p10: 650 p50: 650 avg: 650 p95: 650
[ dtls: server/1.3 ice: controlled pqc: 0 dtls_in_stun: 0  ]] RESULT: p10: 750 p50: 750 avg: 750 p95: 750
[ dtls: server/1.3 ice: controlled pqc: 0 dtls_in_stun: 1  ]] RESULT: p10: 550 p50: 550 avg: 550 p95: 550
[ dtls: server/1.3 ice: controlled pqc: 1 dtls_in_stun: 0  ]] RESULT: p10: 850 p50: 850 avg: 848 p95: 850
[ dtls: server/1.3 ice: controlled pqc: 1 dtls_in_stun: 1  ]] RESULT: p10: 650 p50: 650 avg: 650 p95: 650

Result: PQC+DTLS-in-STUN is still an improvement over DTLS12 and over vanilla DTLS13.

The following test
rtc_p2p_unittests --gtest_filter='*Bench*/*' --bench_iterations=25 --bench_server_candidates=1 | & grep RESULT | grep "1.2"
loss: 0  ... [ dtls: server/1.2 ice: controlled pqc: 0 dtls_in_stun: 0  ]] RESULT: p10: 850 p50:  850 avg:  850 p95:  850
loss: 0  ... [ dtls: server/1.2 ice: controlled pqc: 0 dtls_in_stun: 1  ]] RESULT: p10: 650 p50:  650 avg:  650 p95:  650
loss: 5  ... [ dtls: server/1.2 ice: controlled pqc: 0 dtls_in_stun: 0  ]] RESULT: p10: 850 p50:  850 avg:  940 p95: 1300
loss: 5  ... [ dtls: server/1.2 ice: controlled pqc: 0 dtls_in_stun: 1  ]] RESULT: p10: 650 p50:  650 avg:  668 p95:  700
loss: 10 ... [ dtls: server/1.2 ice: controlled pqc: 0 dtls_in_stun: 0  ]] RESULT: p10: 850 p50:  900 avg: 1106 p95: 2060
loss: 10 ... [ dtls: server/1.2 ice: controlled pqc: 0 dtls_in_stun: 1  ]] RESULT: p10: 650 p50:  650 avg:  680 p95:  700
loss: 25 ... [ dtls: server/1.2 ice: controlled pqc: 0 dtls_in_stun: 0  ]] RESULT: p10: 870 p50: 1300 avg: 6208 p95: 11820
loss: 25 ... [ dtls: server/1.2 ice: controlled pqc: 0 dtls_in_stun: 1  ]] RESULT: p10: 650 p50:  800 avg:  976 p95:  1760

shows that even for DTLS 1.2 we had a problem with packet loss during the handshake which gets addressed by DTLS-in-STUN.

Bug: webrtc:367395350
Change-Id: Ia335fb21a20a5588202469544c6d6cd8c5d831ba
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/432920
Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Jonas Oreland <jonaso@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#46470}