glue: otel scrape targets for authelia, grafana and nats move out of the services

Part of #3742.

nix/host-modules/default.nix

@@ -42,6 +42,7 @@
     ./glue-nats-auth-bao-identity.nix
     ./glue-nats-bao-identity.nix
     ./glue-nats-oidc-client.nix
+    ./glue-otel-scrape-targets.nix
     ./glue-queue-agent-credential.nix
     ./glue-review-classifier-oidc-client.nix
     ./glue-secret-publisher-bao-identity.nix