Release v1.28.1

Fixed

• Starting a staged job whose first stage continues on failure now reports FailedStartingSomeJobSteps when every step in that stage fails to start but a later stage starts. Before, it reported AllJobStepsFailedStarting, so callers treated a running job as not started. It still reports AllJobStepsFailedStarting when no stage gets a step running. (#113)
• Removing a job no longer stops retrying while a step that could not be reached still has to be told about the removal. The removal retry is armed again, so the removal finishes without waiting for rehydration. (#127)
• Two job removal specifications no longer fail intermittently: they wait for the job state and the job step states to be removed instead of reading them once. (#146) (#144)