Only mark breakpoints done when api call succeeds
Only mark breakpoints done when api call succeeds

The first part of the TODO is deemed no longer necessary because we
already have our request handle retriest for transient errors.

ofrobots/cloud-debug-nodejs,ofrobots/cloud-debug-nodejs,matthewloring/cloud-debug-nodejs,DominicKramer/cloud-debug-nodejs,matthewloring/cloud-debug-nodejs,googleapis/cloud-debug-nodejs,DominicKramer/cloud-debug-nodejs,ofrobots/cloud-debug-nodejs,googleapis/cloud-debug-nodejs,DominicKramer/cloud-debug-nodejs,matthewloring/cloud-debug-nodejs,googleapis/cloud-debug-nodejs