chore: prepare for iterative batch-tx size reduction

This commit places the batch sequencer tx size check inside of a for
loop so that the we can continue to whittle away batch tx sizes until
satisfying the configured maximum. This doesn't result in a behavioral
change, as the for loop exits after the first iteration. This is done to
make the behavioral changes more apparent in subsequent commits.

go/batch-submitter/drivers/sequencer/driver.go

@@ -166,6 +166,7 @@ func (d *Driver) SubmitBatchTx(
 	}
 
 	shouldStartAt := start.Uint64()
+	for {
 		batchParams, err := GenSequencerBatchParams(
 			shouldStartAt, d.cfg.BlockOffset, batchElements,
 		)
@@ -205,4 +206,5 @@ func (d *Driver) SubmitBatchTx(
 		opts.GasPrice = gasPrice
 
 		return d.rawCtcContract.RawTransact(opts, batchCallData)
+	}
 }