wgengine/magicsock: remove pickPort, use port 0 to avoid TOCTOU race

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pickPort would bind a UDP socket on :0 to get a free port, close
the socket, then hope to rebind to the same port in NewConn. This
is a TOCTOU race that can cause flaky test failures when another
process grabs the port in between.

Instead, pass Port: 0 to NewConn and let the OS assign the port
atomically, then read back the assigned port via conn.LocalPort().

Fixes #19409

Change-Id: Ie44b599fb93c361e29a05f2171ad747c46f82b7a
Co-authored-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>

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