[control-panel-ui] Provide a default "card" for custom health indicators details

[LeBezout]

Feature description

If in our app we implements some custom health indicators and if we go to the /control-panel/health detail page, this failed to display.

Actual Behaviour

  "_embedded": {
    "errors": [
      {
        "message": "Internal Server Error: Error rendering Handlebars view [layout]: /views/health/detail.hbs:17:29: The partial '/(stringFormat \"views/health/%s\" (cut @key '()')).hbs' at '/views/health/MyCustomIndicator.hbs' could not be found"
      }
    ]
  },
  "message": "Internal Server Error"

Steps To Reproduce

1. Implements a io.micronaut.management.health.indicator.HealthIndicator
2. Start app and launch /control-panel/health page
3. You can see an "Internal Server Error" message

Expected Behavior

If the view is not found display a default message like "No information available" in a card titled with the indicator name.

[alvarosanchez]

Related to #59