[Bug]: pos validator removal fails for a validator that is not bootstrap and never tracked the subnet

[felipemadero]

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[arturrez]

after looking through the code

• we only track if validator is a bootstrap validator( tracked in sidecar)
• there is no way for us to know if validator to be removed is tracking subnet or not as it it's added via validatorManager smart contract and we can't get list of current validatorsm for the PoS L1