release-22.1: backupccl: mark backup ExportRequests as Bulk priority #79333
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Backport 1/1 commits from #79086 on behalf of @dt.
/cc @cockroachdb/release
This adds a new "bulk normal" priority that is lower than normal user priority but higher than low user priority, and then assigns that priority on AddSSTable and Export requests.
Release note (bug fix): BACKUP read requests are now sent with lower admission control priority than normal traffic.
Release justification: bug fix