Fix deferrable mode for BeamRunJavaPipelineOperator

[MaksYermak]

In this PR I have prepared a fix for an error in deferrable mode for BeamRunJavaPipelineOperator.

This error happens on a distributed system when the user has trigger and worker on different machines. BeamRunJavaPipelineOperator needs a local jar file for starting a Job. Users can specify a path to jar file which is located in GCS bucket and then the operator will download this file to the local system. In the current deferrable mode implementation operator downloads jar file before going to the deferrable mode. It means that on a distributed system the file is downloaded on the worker machine not on the trigger machine. And then when the operator tries to execute a Job on the trigger machine Airflow throws an error that the executable jar file does not exist.

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[VladaZakharova]

Hi @eladkal @potiuk !
Can you please check the changes here? Thanks!

[MaksYermak]

@potiuk @Lee-W I have updated the code.