Spawn update coro directly through dispatcher

[mmcshane]

What was changed

Spawn update coro directly through dispatcher

Why?

Calling Go/GoNamed with a context from outside the workflow will fail
because the context doesn't have a handle to dispatcher state.

Checklist

1. Closes

n/a

2. How was this tested:

Defect found via sdk-features test for update which will land soon

3. Any docs updates needed?

No

[cretz]

Makes sense. Technically could have used the root context to start the go named I think, but I think direct dispatcher coroutine creation is the same.

[mmcshane]

[...] could have used the root context to start the go named

Do you mean the workflow definition's rootCtx? That's what I was previously using but didn't work. I'd prefer to use GoNamed if you think we can figure out the right Context to use.

[cretz]

My mistake, I thought rootCtx was the same ctx we gave to the user. Ignore me.