sqlccl: remove external storage dependency on RESTORE cleanup #21559
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If RESTORE failed and attempted to delete the data it had added,
it would fail to do so if the underlying external data had been
deleted. This would cause the job to forever be in a state where the
job could neither be canceled or failed because those methods would
never succeed, causing the job to loop forever in the registry.
Remove the dependency on the external storage by storing the sql
descriptors in the job details.
Release note (enterprise change): make RESTORE cleanup resilient to
external storage failure or removal
Fixes #20261