Exercises `dropViewAsync` against the mock server both ways: a 202 carrying a
`job_id` surfaces that id, and a 200 -- nothing was bound to the name -- yields
an already-finished job with none.
The wire key is written as raw JSON rather than an object literal, which is what
the rest of this file does and what keeps `useNamingConvention` off a snake_case
field the server chooses.