Fix TxProcessor TokenID use &updates at Til&Common

- Til
  - tests that were using `til.SetBlockchainMinimumFlow0` have been
updated, as now the L1CoordinatorTxs are placed simulating TxSelector
creation (when needed, not before)
  - Add `EthSk` to `tc.User` to allow to sign `AccoutCreationAuths` at
the tests flows
- TxProcessor
  - for L2Txs get TokenID from tx.FromIdx Account.TokenID instead than
  - update tests vectors for new values
from tx.TokenID (which not always is set)
- Common
  - move TxIDsFromL2Txs & TxIDsFromPoolL2Txs from `coordinator` to
`common` to allow usage from other packages

common/l2tx.go

@@ -124,6 +124,15 @@ func L2TxsToPoolL2Txs(txs []L2Tx) []PoolL2Tx {
 	return r
 }
 
+// TxIDsFromL2Txs returns an array of TxID from the []L2Tx
+func TxIDsFromL2Txs(txs []L2Tx) []TxID {
+	txIDs := make([]TxID, len(txs))
+	for i, tx := range txs {
+		txIDs[i] = tx.TxID
+	}
+	return txIDs
+}
+
 // BytesDataAvailability encodes a L2Tx into []byte for the Data Availability
 func (tx L2Tx) BytesDataAvailability(nLevels uint32) ([]byte, error) {
 	idxLen := nLevels / 8 //nolint:gomnd