fix: relaylist: Check exit to all domains/ips

When an exit policy allows to exit only to some subnet, it is not enough to check that it can exit to a port, since it can, but it might not be able to exit to the domain/ip of the sbws Web servers. To ensure that without having to check whether it can exit to a specific domain/ip, we can query the exit policy with strict.

Closes #40006. Bugfix v1.0.3.