Parse out exception name + message, expose as grid cols in Hoist Admin client error reporting

[amcclain]

Client errors that are reported back and available for review in the Admin Console very consistently (although maybe not always) have a name and message property on the serialized exception itself.

It would be helpful if we (safely) parsed the JSON error payload and extracted those two fields to promote to top-level fields on the grid records. You can add the JSON error to the grid and get some approximation of this, but it would be simpler/cleaner if I could just view/sort/filter the error name itself.

For any client errors that lack either property, we can just leave the field null.

[amcclain]

@Ryanseanlee this would be a nice little Hoist ticket to get done, especially while waiting on next-up client projects.