[Bug]: SimpleFIN "upgrading connection" needs to be surfaced as an error

### What happened?

I have an account in SimpleFIN that is showing "We are upgrading this connection. Please wait..." The problem is that this account has been stuck in this state for 6 weeks. I wasn't aware of this because Actual does not surface an error during bank sync, and keeps showing the green sync dot next to the account. This error state needs to be communicated to the user so that they know their data is incomplete.

### How can we reproduce the issue?

Not sure how to reproduce, requires SimpleFIN account in a particular broken state

### Where are you hosting Actual?

Docker

### What browsers are you seeing the problem on?

Chrome

### Operating System

Linux