fix: [compose-core] prevent hard to debug issue with output leaking out

bin/compose-core

@@ -2860,11 +2860,11 @@ get_all_relations () {
     declare -A services
     services_uses=()
     ## XXXvlab: bwerk, leveraging cache to be able to get the errorlevel here.
-    _get_services_uses "$@" || return 1
+    _get_services_uses "$@" >/dev/null || return 1
     array_read-0 services_uses < <(_get_services_uses "$@")
     services_provides=()
     ## XXXvlab: bwerk, leveraging cache to be able to get the errorlevel here.
-    _get_services_provides "$@" || return 1
+    _get_services_provides "$@" >/dev/null  || return 1
     array_read-0 services_provides < <(_get_services_provides "$@")
 
     for service in "$@"; do