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Do not store the job jar in usrlib

DCausse requested to merge do-not-job-jar-in-usrlib into main

Try to fix classloading issues with scala: scala.MatchError: None (of class scala.None$) Assumption is that flink is loading this jar twice:

  • because present in usrlib
  • because passed as an argument of the FlinkDeployement JobSpec despite being optional, flink will fail if not set.

Bug: T328675

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