framework/output: add discover_wa_outputs
framework/output: add discover_wa_outputs

Add a function that traverses a directory structure looking for WA
output directory and yielding corresponding RunOutput objects.

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