The `generate_tarball` job vendors all Go modules to make packaging for
distributions easier.

Initialize eventsLogger for WebRTCPeer in client library test.

Let's reserve Tor error logs for more severe events that indicate
a client-side bug or absolute failure. By default, tor logs at severity
level notice (and above).

This change adds two new connection failure events for snowflake
proxies. One fires when the datachannel times out and another fires when
the connection to the proxy goes stale.

Fixes a bug where an uninitialized channel causes a panic when closed
(#40099).

Due to a bug (#40098), legacy oneshot connections have not worked for
awhile. Connections without the turbotunnel token would cause the server
to crash. This fixes that bug by removing support altogether and simply
closes the connection.

See also:
!72 (comment 2772839)

See also:
https://gitlab.torproject.org/shelikhoo/snowflake/-/jobs/86751

See also:
!67 (comment 2771666)

See also:
!67 (comment 2770482)

This name includes [E]vent to reduce merge conflict with forward proxy change set.

This event bus implementation favours simplicity over efficiency and is not suitable for frequent addition and removal of listeners.