UI should display the web3signer healthcheck errors if any

[pablomendezroyo]

The UI should display the errors from the web3signer /healthcheck if any. Check the upstream docs:

The data type of the errors is:

{
"status": "string",
"checks": [
{
"id": "string",
"status": "string"
}
],
"outcome": "string"
}