device health status is incomplete

[karenetheridge]

In src/views/DeviceInspector/OverviewTab.vue in the release/v4 branch, I see a conditional on device.health (to dispay "Failing Validation", "Passing Validation" etc), but the only values that are checked are "fail", "pass" and "unknown". There is a fourth status, "error", which should also be checked and displayed. (This enum is defined in the json schemas available in the documentation and via the GET /schema/... endpoints.)

Note that sometimes health could be "error" when the most recent validation_state+validation_result records show a pass result -- this is because not all error conditions are caused by validation failures.