Which run a dbt retry of this script would resume for the caller

A retry requires dbt_retry_job, and the run form has no job id to hand. Returns the one the caller's own retry would land on — the saved failure for the principal the run would execute as, which is the script's author for an on_behalf_of script and the caller otherwise — and only when that run is one the caller may read. Null when there is nothing to resume, or nothing this caller may be told about.