[TRI-1377] Throwing a string from inside runTask doesn't bubble up properly to the run

[matt-aitken]

If you do this inside of run, the run fails (which is correct) but you get "Unknown error" on the run.

await io.runTask(
    "a-task",
    async () => {
       throw "Shopify Order not found";
    },
);

It works properly if you do throw new Error("Shopify Order not found");

_TRI-1377

[martinse]

The same issue if throwing custom objects, e.g. throw {"something": "custom"};

[msk4862]

@matt-aitken I'm trying triage this issue, can you please help understand on how can I test the updated io.runTask function in my local setup?