cmd/tailscaled: log SCM interactions if the policy setting is enabled at the time of interaction

This updates the syspolicy.LogSCMInteractions check to run at the time of an interaction,
just before logging a message, instead of during service startup. This ensures the most
recent policy setting is used if it has changed since the service started.

Updates #12687

Signed-off-by: Nick Khyl <nickk@tailscale.com>
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