YBB rebalance refactor #664

Job	Run time
No .only	8s
Test e2e on custom fee token chain	9m 53s
Test hardhat	1m 21s
Test e2e on 6-decimals custom fee token chain	11m 9s
Test unit	1m 28s
Test e2e	9m 53s
Test storage layout, signatures and look for unused errors	4m 3s
	37m 55s

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