Fixes scheduler-side KV connector stats collection so that: 1. update_connector_output() runs before scheduler-side stats are collected. 2. worker-side and scheduler-side KV connector stats are aggregated when both are present. 3. scheduler-only KV connector stats are still emitted when no worker-side stats exist. Signed-off-by: srinivas_oo7 <sklinkedin0120@gmail.com> Co-authored-by: srinivas_oo7 <sklinkedin0120@gmail.com>