transient_error_retry - Retry transient errors when attempting to insert_tasks, and re-raise if the reinsert fails.

Instead of silently failing on a TransientError on task inserts, we check the options to see if we should retry the failure (after a delay).  If the retry fails, we re-raise.

Currently, the default option is to retry.  I can't think of a scenario that the called would not want to have the errors retry, or at least trigger an error.
As a side effect, this may break custom implementations of ```_insert_tasks``` since we have added a parameter.

@beaulyddon-wf @robertkluin-wf @johnlockwood-wf @tannermiller-wf @rosshendrickson-wf @macleodbroad-wf @tylertreat-wf

FYI: @jasonaguilon-wf @erikpetersen-wf