fix: arbitrum chain id check in all ChainSpecificUtil methods #10756
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The arbitrum chain id check needs to be the same in all of the methods exported in the ChainSpecificUtil contract. Prior to this change getBlockNumber, getCurrentTxL1GasFees and getL1CalldataGasCost did not correctly check for all possible arbitrum chain ids.
To prevent this kind of error in the future, a new private function isArbitrumChainId was created and used in all methods that need to check the chain id.
Followup to #10615