ref(relay): Remove PK and rely on INTERNAL_IPS (#572)

This patch adds INTERNAL_IPS definition to sentry.conf.py by sniffing the network from eth0 and relies on this for trusted Relays instead of the ALLOWLISTED PKs. This removes the necessity of syncing Relay PKs to sentry.conf.py.

This PR needs getsentry/sentry#19798 to work.