API helper submit_results in some cases refresh node from API even not necessary

Follow-up to https://github.com/kernelci/kernelci-pipeline/pull/434

In kunit and kbuild jobs we add copy of whole node with job itself, which will be "stale" at job completion, because some fields might be added or updated (for example job_id). This is why initially submit_results refresh node from API.
But in lava-callback we retrieve node by id at job completion in callback process itself, so refresh at submit_results is not necessary and might create unnecessary burden on server and delays in job submission. We need to handle such issues properly.