Reverting cincinnati#967. We'd restored this during the excitement of OTA-1376, but raising MIN_REPLICAS in app-interface!122139 (internal repository, sorry external folks) should have been enough to have the ScaledObject.keda.sh controller bump the Deployment's replicas up to 12. By restoring replicas in the Template's Deployment, we will now get:

• The Deployment returning to MIN_REPLICAS and terminating any additional (but required to serve the current load) pods. Keda will quickly reset to its suggested replicas, but we'll have OTA-1376 style disruption while those replacement pods are created and slowly come online (OTA-1375, OTA-1379).
• The Deployment returning to replicas:1 once when we promote this ticket's removal of replicas, as predicted by AppSRE (another internal link, sorry external folks). We probably want to coordinate the timing of this bump, so I'm creating this ticket and folks can declare things like OTA-1377 or OTA-1375 blockers if they want, so we ensure we're sufficiently prepared and have an acceptable time before eating the disruption.