release-20.1: backupccl: properly propagate error when failing to commit job txn #54968
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Backport 2/2 commits from #54577.
/cc @cockroachdb/release
This bug was introduced in 20.1. It means that any errors to commit the job
are not reported and instead an inscrutible error is reported.
Release note (bug fix): Fixed a bug which lead to inscrutible errors being
returned when creating a backup failed, for example, due to protected timestamp
limits.