BB8 Daemon using Dataset approach instead of rule approach

[amanrique1]

Description

When doing tests for implementing this daemon in CMS, the following errors were found:

• Many rules expired before the creation date (requests stay alive and put extra pressure on FTS)
• Multiple move rule for a container (as many datasets exist). list_rebalance_rule_candidates approach is dataset-based and not rule-based
• Unique lock restriction is not preserved. Moving a container-leveled rule having at least 1 dataset with only 1 lock won't generate the expected space-saving result

Steps to reproduce

Rebalance a rule protecting a container with more than 1 dataset

Rucio Version

No response

Additional Information

No response