YBB rebalance refactor #671

Job	Run time
Test hardhat	1m 24s
Test e2e on custom fee token chain	9m 45s
No .only	12s
Test storage layout, signatures and look for unused errors	3m 55s
Test unit	2m 3s
Test e2e on 6-decimals custom fee token chain	14m 13s
Test e2e	11m 54s
	43m 26s

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