[Bugfix][CI/Build] Fix test and improve code for merge_async_iterators
#5096
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This PR fixes an issue where
merge_async_iterators
tests cannot be run inpython<3.10
due to lack ofanext
builtin. It also moves the test to a more appropriate location (test_utils.py
).Functionality-wise, this PR enables async tasks in
merge_async_iterators
to be cancelled with a message starting frompython>=3.9
where it is supported.Related contributions
This is part 1/5 of #5004.