fw/execution: wrap processors' process_job_output.
fw/execution: wrap processors' process_job_output.

Modify execution so that output processors' process_job_output() (but
not export_job_output()) is wrapped by the JOB_OUTPUT_PROCESSED signals.

This makes sense conceptually, and is more useful in practice, as there
are already WORKLOAD_RESULT_EXTRACTION and WORKLOAD_OUTPUT_UPDATE
signals sent by the job, if it's desirable to run before output
processors, but after the job results have been collected.

lisatn/workload-automation,setrofim/workload-automation,setrofim/workload-automation,lisatn/workload-automation,setrofim/workload-automation,ARM-software/workload-automation,setrofim/workload-automation,lisatn/workload-automation,ARM-software/workload-automation,ARM-software/workload-automation,lisatn/workload-automation,ARM-software/workload-automation