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ttljob: add hint to use PK in delete query
This will help avoid choosing a plan that scans a secondary index, which can lead to many KV rows being scanned and also lead to contention. Release note (bug fix): Fixed a bug that could cause DELETE queries sent by the row-level TTL job to use a secondary index rather than the primary index to find the rows to delete. This could lead to some DELETE operations taking a much longer time than they should. This bug was present since v22.2.0.