Why batch submitter record TxConfirmed twice?

[ohbyeongmin]

Bug Description
When submitting transactions to the batchInbox, op-batcher record the confirm metric twice.

optimism/op-batcher/batcher/channel_manager.go

Line 113 in 5004fd1

s.metr.RecordBatchTxSubmitted()

optimism/op-batcher/batcher/channel.go

Line 75 in 5004fd1

s.metr.RecordBatchTxSubmitted()

op_batcher_default_txmgr_confirm_total metric is recorded one time. but op_batcher_default_batcher_tx_total metric is double of op_batcher_default_txmgr_confirm_total

Steps to Reproduce
delete one of them

Expected behavior
I'm confused about how many batches have been submitted.

Environment Information:

• Operating System: M1, docker container
• Package Version (or commit hash): develop branch

Configurations:
Command line flags or environment variables you're using.

Logs:

Additional context
Add any other context about the problem here.