allow empty maxFeePerBlobGas for eth_call

[macfarla]

PR description

• allow for maxFeePerBlobGas to be empty even if versioned hashes are present
• if maxFeePerBlobGas is empty or zero, allow user's balance to be exceeded (same behaviour as other gas params)

Fixed Issue(s)

fixes #6709

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[macfarla]

@fab-10 does it makes sense to add the blob gas checks under the isAllowExceedingBalance flag - so don't check blobGasPrice or maxFeePerBlobGas if isAllowExceedingBalance is true

[fab-10]

@fab-10 does it makes sense to add the blob gas checks under the isAllowExceedingBalance flag - so don't check blobGasPrice or maxFeePerBlobGas if isAllowExceedingBalance is true

yes it makes sense to me

[macfarla]

@fab-10 does it makes sense to add the blob gas checks under the isAllowExceedingBalance flag - so don't check blobGasPrice or maxFeePerBlobGas if isAllowExceedingBalance is true

yes it makes sense to me

I have made this change. could you review @fab-10 - thanks!

[macfarla]

engine-cancun hive tests passing locally except for occasional known flakiness from Invalid Missing Ancestor Syncing ReOrg, StateRoot, EmptyTxs=False, CanonicalReOrg=True, Invalid P9 (Cancun)