In 64ce7dff, the log interval is modified while the comment is left unchanged.

Change snowflake broker test for updated address

Amend DefaultBridges Value

Add Default Fingerprint Info for Snowflake

Design difference from original vision: Skipped FQDN step to make it more generalized
tpo/anti-censorship/pluggable-transports/snowflake#28651 (comment 2787394)

Use math/rand instead of crypto/rand, so entropy is not a blocker when
running the tests.

After the initial NAT probe test, a full interval before starting the
recurring NAT retests.

Remove client/pt_event_logger.go file as is very minimal.

To make it safe for logging safelog.Scrub function is now public.

Closes: #40141

This bumps the version of pion/dtls to v2.1.5 to fix three CVEs:
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=2022-29189
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=2022-29190
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=2022-29222