Relayer: Test that relayer fails and prevents tx submition if the message is not ready for relay

[GabrielBuragev]

The OP relayer service lacked a check for the READY_FOR_RELAY message status. With the OP Bedrock work, we somehow removed it.
Without that, there was a possibility that the relayer tries to relay a message even though the message haven't arrived on L1 - which results in failing transactions on L1.

This was fixed in #1992 but it would be good to write some tests for it and in general think about how we can extend the tests for the relayer.