feat: 🎸 adapt number of replicas to flush the queues
<img width="394" alt="Capture d’écran 2023-01-31 à 09 59 04" src="https://user-images.githubusercontent.com/1676121/215714662-1ede53b7-f50f-4a10-a367-115d49728e9b.png">


Current status: https://grafana.huggingface.tech/d/i7gwsO5Vz/global-view?orgId=1&from=now-15m&to=now&refresh=1m&var-slo_quantile_99_5=0.995&var-slo_quantile_85=0.85&var-slo_period=7d

A lot of jobs in /first-rows (critical for the Hub) and /parquet-and-dataset-info (less critical for now, only for parquet files)
feat: 🎸 adapt number of replicas to flush the queues: <img width="394" alt="Capture d’écran 2023-01-31 à 09 59 04" src="https://user-images.githubusercontent.com/1676121/215714662-1ede53b7-f50f-4a10-a367-115d49728e9b.png">


Current status: https://grafana.huggingface.tech/d/i7gwsO5Vz/global-view?orgId=1&from=now-15m&to=now&refresh=1m&var-slo_quantile_99_5=0.995&var-slo_quantile_85=0.85&var-slo_period=7d

A lot of jobs in /first-rows (critical for the Hub) and /parquet-and-dataset-info (less critical for now, only for parquet files)