core/types: remove unused ErrInvalidTxType var (#32989)

The var `ErrInvalidTxType` is never used in the code base.

Author: cuiweixie

core/types/transaction.go

@@ -34,7 +34,6 @@ import (
 var (
 	ErrInvalidSig           = errors.New("invalid transaction v, r, s values")
 	ErrUnexpectedProtection = errors.New("transaction type does not supported EIP-155 protected signatures")
-	ErrInvalidTxType        = errors.New("transaction type not valid in this context")
 	ErrTxTypeNotSupported   = errors.New("transaction type not supported")
 	ErrGasFeeCapTooLow      = errors.New("fee cap less than base fee")
 	ErrUint256Overflow      = errors.New("bigint overflow, too large for uint256")