nixos/grafana: loosen systemd syscall sandboxing
nixos/grafana: loosen systemd syscall sandboxing

Allow @resources syscalls in the grafana.service unit. While Grafana
itself does not need them, some plugins (incl. first party) crash if
they fail to setrlimit. This was first seen with the official grafana
Clickhouse datasource plugin.

The @resources syscalls set is fairly harmess anyway.

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