fix: make run_step return all the events produced by a step #18082
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Description
Previously,
run_step
would return only the event produced by steps in their return value. But events can also be produced using thesend_event
method of the Context, and those were ignored during stepwise execution. This PR fixes that issue.Note: I had to change the return type of
run_step
from a single event to a list of events, which is consistent with what the method is supposed to do: returning all the events that were produced in the step. While technically this is a breaking change, since the previous version couldn't work I propose we roll out this change as a bugfix instead.Follow-up of #17898