test: add another balances delay flow

Author: arad-starkware

src/flow_test/flow_ideas.md

@@ -59,7 +59,6 @@ more ideas:
 - staker enter in V0, advance epoch, update balance, advance epoch, update balance, upgrade to V3, attest
 - staker enter in V1, advance epoch, update balance, advance epoch, update balance, upgrade to V3, attest
 - staker in V2, update balance staker+update balance pool, upgrade, attest in current epoch, attest in next epoch, attest in next next epoch
-- staker in V2, advance epoch, update balance staker+update balance pool, advance epoch, update balance staker+update balance pool, upgrade, update balance staker+update balance pool, attest in current epoch, attest in next epoch, attest in next next epoch
 
 ## pool member balance at curr epoch migration
 - Member from V0, no actions in V1 or V2, test curr balance