fix: Add missing fields to Transaction.CopyTo and PoolPolicy.Return #9890
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CopyTo was missing IsAnchorTx field - this breaks gas estimation for Taiko anchor transactions since TaikoTransactionProcessor checks this flag for special handling (skip validation, no gas purchase, no refunds).
PoolPolicy.Return wasn't resetting:
These fields persist between pooled object reuses, causing data leakage. A normal tx could inherit IsAnchorTx=true or Optimism deposit data from previously returned transaction.