Record errors from `parallel.Threads` in `$inventory.failures`, so that it's possible to report on that

Modify these places: https://github.com/search?q=repo%3Adatabrickslabs%2Fucx%20%22https%3A%2F%2Fgithub.com%2Fdatabrickslabs%2Fucx%2Fissues%2F406%22&type=code
to persist errors in a `$inventory.failure`
to display on a dashboards