Fix type hinting for automatic run inputs

[bunchesofdonald]

This fixes the type hinting for automatic run inputs. Previously if you passed a str or anything else that wasn't a RunInput subclass into pause_flow_run or receive_input the type hint would come back as Any. This makes it so that those hints are accurate.

There is one caveat to this, if you pass in a pydantic model:

class MyModel(pydantic.BaseModel):
    name: str
    value: str

...
    input = await receive_input(MyModel).next()

input in this case will be hinted as a MyModel instance, which is technically inaccurate. input will be a subclass of RunInput and MyModel. I chose to go this route rather than hinting that it was a generic RunInput class, but could be convinced that it makes sense the other way.

Closes #11792

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[abrookins]

I'm good with this! 👍