Autoscaler logs are full of deprecated key warnings

We moved all autoscaler configuration from kubernetes.operator.job.autoscaler. to job.autoscaler..

With the latest release, the logs are full with logs like this:

level:  WARN 
logger:  org.apache.flink.configuration.Configuration 
message:  Config uses deprecated configuration key 'kubernetes.operator.job.autoscaler.target.utilization' instead of proper key 'job.autoscaler.target.utilization' 

The reason is that the configuration is loaded for every reconciliation.

This configuration is already widely adopted across hundreds of pipelines. I propose to remove the deprecation from the config keys and make them "fallback" keys instead which removes the deprecation warning.