release-21.2: backupccl: Fix SHOW BACKUPS on a bucket's base directory #80510
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Backport 1/1 commits from #80182.
/cc @cockroachdb/release
Fixes #77930. Tested on GS and AWS.
Release note (enterprise change): Fix bug where backups in the base directory of a cloud storage bucket would not be discovered by SHOW BACKUPS. These backups will now appear correctly.
Release justification: A low-risk bugfix for a user-facing issue.