output_processors/postgresql: Refactor and fix uploading duplication
output_processors/postgresql: Refactor and fix uploading duplication

Previously run level artifacts would be added with a particular job_id,
and updated artifacts would be stored as new objects each time. Refactor
to remove unnecessary instance variables, only provide a job_id when
required and add an update capability for largeobjects to ensure this
does not happen.

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