Simplify unit testing using new dispatchtest.Call
helper
#15
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While writing a testing guide (https://github.com/dispatchrun/dispatch-go/wiki/Testing-Functions-&-Workflows), I found it was awkward having to manually build a call to the function I was testing, and then having to specify the output type parameter because of type erasure on the call.
I've reworked the test helper so that it's no longer necessary to build a call or to specify the output type.