Provide feedback when there's no eth1 connection

[paulhauner]

Lighthouse users can disable syncing via eth1 (by not supplying --eth1 or --staking). It would be nice if the GUI could tell users "you don't have eth1 enabled and you'll never sync" instead of showing a 0% progress or other error. However, there is no API endpoint for this, so this issue is blocked.

[daniel-flex]

Agree. When the flag is not enabled it returns an error message when hitting /lighthouse/eth1/syncing, so could use that.

[paulhauner]

When the flag is not enabled it returns an error message when hitting /lighthouse/eth1/syncing

Oh yeah, that's right. That's all the information we need then.

Could we perhaps add the following text if you get that specific error?

The beacon node needs to be restarted with the --eth1 flag.

And we should make it red like an error, since it wont get fixed without them doing something.

[daniel-flex]

need designs around this - tagging design

[daniel-flex]

[qnou]

@daniel-flex So the tagging system is supposed to be propagated exactly where the text shows up in the card on the bottom left. Please view the prototype update for example.